## INTRODUCTION

Tobacco use is the single most preventable cause of death in the United States1, causing 438 000 premature deaths annually2. Although the prevalence of cigarette smoking is decreasing, use of alternate tobacco products have increased3. The use of one such tobacco product, hookah or waterpipe, has become a global epidemic among young people4. As a result of its growing popularity, hookah use has become a threat to public health.

In terms of health consequences, hookah users absorb nicotine in amounts comparable to cigarette smokers and absorb more carbon monoxide5. Both hookah and cigarettes have substances like nicotine, tar, carbon monoxide, and deleterious gases such as volatile aldehydes, ultrafine particles, and polycyclic aromatic hydrocarbons6. Hookah users are also exposed to charcoal combustion6,7, and the spread of infections from sharing the same mouthpiece and hose8. Additionally, hookah users may experience nicotine-dependence symptoms earlier than cigarette smokers9. Despite these risks, young people are generally unaware of the constituents of hookah10, and believe that hookah use is less harmful, less polluting, and less addictive than cigarette smoking11,12.

In addition to misperceptions of the low harms of hookah use, social image and facilitation may be reasons for hookah use. Among young adults, hookah use appears trendy and cool13,14, and is socially acceptable among friends and peers15,16. Peer hookah use influences use of hookah12,17. People prefer consuming hookah over alcohol16, as it is more affordable and its cost can be shared among friends18. Emergence of hookah bars and cafes near college/university campuses intensifies concerns about the vulnerability of students initiating hookah19. In addition, restaurants have increasingly begun to offer hookah in response to the demand by the consumers and competitors19, which may influence people to experiment with it20.

The tobacco marketplace has also diversified in terms of hookah design (e.g. personal devices)21 and flavors22,23. Creative ideas have been devised for fluid storage bowls, such as cored pineapples or watermelon, and carving an orange or an apple; or using shiny ornaments and crystal bottles to appeal to women in particular21,24. Flavored tobacco, along with attractive and seemingly healthy packaging, has attracted youth25,26. The smell and taste of flavored tobacco is more enticing, and overall the experience has been reported to be more pleasant when compared to cigarette smoking27,21. Additionally, the ability to personalize hookah, including mixing flavors and performing smoking tricks, allures youth13,24.

Media have a strong influence in successful marketing and promoting hookah use among young adults28,29. Prominent marketing strategies include advertisements on televisions30, and showing waterpipe tobacco smoking in movies21, as well as satisfying the online demand for information and driving social media activity surrounding hookah28,31. Indeed, the waterpipe industry leverages various media channels to promote, market, and sell their product to the public, marketing hookah as a safer alternative to conventional tobacco products31,32.

Considering the rise of hookah use in young adults, it is paramount to understand the individual and socio-contextual characteristics associated with the reasons for its use. Bandura’s Social Cognitive Theory (SCT)33 indicates the importance of outcome expectancies and social influence on health behaviors, including hookah use33. The aforementioned research highlights the influences of perceptions of harm, social factors, and the draw of product design and marketing. However, there is limited previous research that aimed to quantitatively examine who is most likely to initiate or sustain hookah use, the characteristics of hookah use among users, or the range of potential reasons (e.g. outcome expectancies) for use, potential use, or discontinued use of hookah.

Given the aforementioned literature and the gaps in the research, the aims of this study were to: 1) assess differences in socio-demographics and other substance use among current (past 4 months), never, and former users of hookah; 2) characterize hookah use among current users (e.g. use levels, places of use, types of devices used, flavors most frequently used, quit intentions and confidence); and 3) assess reasons for use, potential use, and discontinued use among current, never, and former hookah users, in the young adult population.

## METHODS

### Study design

The current study is an analysis of data from Project DECOY: Documenting Experiences with Cigarettes and Other tobacco in Young adults. This study was approved by Emory University and ICF International Institutional Review Boards, as well as those of the participating colleges. The methods employed in Project DECOY are documented in detail elsewhere34. In short, the parent study involved a 2-year longitudinal cohort study involving 3418 racially/ethnically diverse young adults attending seven Georgia colleges/universities. Data collection began in Fall 2014 and consisted of individual assessments every 4 months for 2 years (Fall, Spring, Summer).

### Participants

The primary sampling frame includes seven Georgia campuses, including two public universities, two private colleges/universities, two community/technical colleges, and a historically black university with representation from rural and urban settings. The rationale for sampling from these institutions was to obtain a broad range of young adults in terms of socio-demographic backgrounds and to put study findings in the context of campus-related factors and campus tobacco control policies/activities. Inclusion criteria for participants were: 1) age ≥18 and ≤25 (to include the broad range of young adult ages, but reduce overall age variability), and 2) ability to read English.

College email addresses were obtained from the Registrar’s office from each college/university for students meeting eligibility criteria. Three thousand 18-25 year-old adults were randomly selected from one private and two public universities. The remainder of the schools had 18-25 year-old student populations of fewer than 3000; thus, the entire student population of that age range at those schools was included in recruitment. Our total response rate of 22.9% (N=3574/15607), albeit low, was over a very short period and met our sampling targets. We employed a graduated compensation schedule ($30 for the first two assessments,$40 for the second two, $50 for the final two), with an additional$100 incentive for participating in all assessments. The current analyses examined data from the Wave 3 assessment of the study, which was conducted during July/August 2015. The sample size during Wave 3 was 2865 (83.8% retention rate).

### Measures

The current analyses focused on factors related to hookah use (e.g. places used, types/flavors used, reasons for use, potential use, discontinued use), other tobacco and substance use behaviors, and socio-demographics.

Hookah use. The hookah users have been characterized into never users, current users (using hookah at least 1 day within the past 4 months) and former users (had used in their lifetime, but not within the past 4 months). A 4-month period was used because our assessments occurred every 4 months; thus, this assessment provided a complete characterization of hookah use over the 2-year study period. (We also assessed within the past 30 days hookah use but chose to use the 4-month period, given the infrequency of hookah use reported by participants and the desire to assess reasons for use among even infrequent users.) We created new items to assess places of hookah use, types of hookah devices used, and flavors most frequently used. To assess places of use, we asked, ‘In the past 4 months, where have you used hookah?’, with response options of: ‘at a hookah bar or other public establishment, at someone else’s home, at your home, or other’. Types of hookah devices used was assessed by asking, ‘Which of the following types of hookah pipes have you used in the past 4 months?’, with response options of: ‘a larger hookah pipe that sits on the table, a personal handheld hookah device that can be easily carried with you, or other’. To assess flavors most frequently used, we asked, ‘What flavors of tobacco (shisha) from a hookah or water pipe do you use most of the time? Check up to 3’. The response options were: ‘tobacco; menthol or mint; fruit flavors; coffee or tea; alcoholic drink flavors (for example mojitos and daquiris); caramel, vanilla, chocolate, and cream; candy flavors (for example licorice, gummy bears, or bubble gum); other food flavors (for examples cupcakes or muffin); or other’.

Hookah quitting-related factors. We adapted items used for cigarettes to examine confidence in quitting hookah use, importance of quitting, readiness to quit, and previous quit attempts. We asked participants, ‘On a scale of 1 being not at all confident and 10 being extremely confident, how confident are you that you could quit using hookah if you wanted to?’ and ‘On a scale of 1 being not at all important and 10 being extremely important, how important is it to you that you quit using hookah?’35. To assess readiness to quit, we asked, ‘Are you seriously thinking about quitting the use of hookah?’, with response options of: Yes, within the next 30 days; Yes, within the next 6 months; Yes, in more than 6 months; I am not thinking about quitting the use of hookah. We dichotomized this variable as intending to quit in the next 30 days versus not. To assess quit attempts, we asked, ‘During the past 12 months, how many times did you stop using hookah for one day or longer because you were trying to quit using hookah for good?’, with a dropdown box from 0 to 31 or more times. This variable was dichotomized as: made at least one quit attempt in the past 12 months versus no attempt.

Reasons for hookah use and discontinued use. Items regarding reasons for hookah use, potential use, and discontinued use were based on qualitative interviews conducted at Wave 2 and developed and refined by our research team (manuscripts currently under review). Participants reporting a within past-4-months use of hookah were instructed, ‘You indicated that you have used hookah at least once in the past 4 months. Below are some reasons for why you might use hookah’. Items are listed in Table 1. Participants reporting no use of hookah in their lifetime were instructed, ‘You indicated that you have never used hookah. Below are some reasons for why you might use hookah’. Items are listed in Table 2. Participants reporting lifetime, but not within past-4-months use of hookah were instructed, ‘You indicated that you have used hookah at least once in your lifetime but have not used hookah in the past 4 months. Below are some reasons for why you might have quit using hookah’. Items are listed in Table 3. All participants were instructed, ‘Please indicate how true each of these reasons are for you using the scale below’ (response options of 1-not at all true to 6-extremely true).

##### Table 1

Reasons for use of hookah among current (past 4 months) hookah users

InstrumentalitySocialM (SD)
Hookah comes in appealing flavors0.910.483.39 (1.91)
I like experimenting with the various flavors0.900.532.93 (1.97)
I like the buzz I get from nicotine but do not like regular cigarettes0.700.572.15 (1.73)
Hookah helps me relax0.780.652.53 (1.81)
People who are important to me use hookah0.520.782.06 (1.57)
I use hookah because I think they are cool or intriguing0.570.812.16 (1.59)
I like socializing with other hookah users0.580.722.82 (1.81)
I like the image of me it reflects0.370.861.61 (1.30)
Cronbach’s alpha0.890.81

[i] Note: On a scale of 1-not at all true for me to 6-extremely true for me.

[ii] Extraction Method: Principal Component Analysis. Rotation Method: Promax with Kaiser Normalization.

##### Table 2

Reasons for potential use of hookah among never users of hookah

FactorM (SD)
Hookah comes in appealing flavors0.821.37 (1.00)
I like the buzz I get from nicotine but do not like regular cigarettes0.731.11 (0.55)
I would like socializing with other hookah users0.821.29 (0.88)
People in the media or other public figures use hookah0.651.32 (0.98)
Cronbach’s alpha0.80

[i] Note: On a scale of 1-not at all true for me to 6-extremely true for me. Extraction Method: Principal Component Analysis. One component extracted.

##### Table 3

Reasons for discontinued use of hookah among former users of hookah

InconvenienceAnti-tobaccoSocialM (SD)
I didn’t like the buzz0.850.550.422.57 (2.01)
I didn’t like the flavor0.910.480.462.29 (1.90)
It was messy0.860.420.532.26 (1.86)
It was too expensive0.780.440.542.55 (1.92)
I didn’t like the smell0.890.500.562.28 (1.86)
I just don’t think about it0.390.620.313.84 (2.15)
I quit tobacco/nicotine all together0.420.830.513.11 (2.30)
I don’t like idea of using any kind of nicotine/tobacco0.490.890.563.46 (2.30)
I think it's unhealthy0.500.860.563.64 (2.20)
My friends don't use tobacco0.450.650.762.66 (2.03)
Someone important to me asked me not to use it0.410.330.772.04 (1.81)
It hasn't come up in social situations0.300.520.693.06 (2.13)
I think it is weird or socially unacceptable0.640.470.842.04 (1.71)
I didn’t like the image it projected about me0.600.600.782.61 (2.07)
Cronbach’s alpha0.910.830.83

[i] Note: On a scale of 1-not at all true for me to 6-extremely true for me.

[ii] Extraction Method: Principal Component Analysis. Rotation Method: Promax with Kaiser Normalization.

Other tobacco and substance use. Participants were first asked to report the number of days they used each product within the past 4 months (to cover the duration of time between each wave of assessment): cigarettes, little cigars or cigarillos (LCCs), smokeless tobacco, e-cigarettes, alcohol, and marijuana1. Those who reported any use within the past 4 months were then asked to report the number of days they used the respective product in the past 30 days. Given the distributions of use, alcohol use was used as a continuous variable, while tobacco and marijuana use were dichotomized as: current (past 30 days) users vs non-users.

Socio-demographics. We assessed age, sex, race/ethnicity, and type of school attended (e.g. private college/university, public university, historically black college/university [HBCU], technical college).

### Data analyses

First, we characterized our sample using descriptive statistics. We then conducted bivariate analyses to examine differences in socio-demographics and other substance use among never, current, and former hookah users. We then compared current and former users to never users (reference group) using multinomial logistic regression. Next, for each of the subpopulations (current, never, former hookah users), we conducted an exploratory factor analysis on the respective sets of items assessing reasons for use among current users, potential reasons for use among never users, and reasons for discontinued use among former users, respectively, using Promax rotation. We used eigenvalues of greater than 1 as the criterion for number of factors. We then conducted bivariate analyses examining subscale scores in relation to correlates of interest (socio-demographics, among current users, quit intentions and attempts). Analyses were conducted in SPSS 23.0, and alpha was set at 0.05.

## RESULTS

### Participant characteristics

Among the 2865 participants in the study, the average age was 20.53 (SD=1.93), 64.4% (n=1846) were female, 1823 (63.6%) were White, 645 (22.5%) Black, 192 (6.7%) Asian, 205 (7.2%) Other, and 218 (7.6%) Hispanic. In our sample, never users were 56.3%, current (past 4 months) users 12.4%, and former users (those who had used in their lifetime but not in the past 4 months) 31.3%.

### Correlates of never, current, and former hookah users

Differences in hookah-use status were found between the never, current, and former users in age (p<0.001), sex (p=0.034), race/ethnicity (p<0.001), type of school attended (p<0.001), and use of each tobacco product, marijuana, and alcohol use (all with p<0.001, Table 4). In the multinomial logistic regression examining differences between never, current, and former users (not shown in Tables), correlates of being a current (vs never) hookah user included being ‘other race’ (vs White, p=0.004), attending an HBCU (vs a technical college, p<0.001), and use of any other tobacco product, marijuana, or alcohol (all with p<0.001). Correlates of being a former (vs never) hookah user included being older (p<0.001), being ‘other race’ (vs White, p=0.009), attending an HBCU (vs a technical college, p=0.01), and use of any other tobacco product (except LCCs), marijuana, or alcohol (all with p<0.001, Nagelkerke R-squared=0.289).

##### Table 4

Participant characteristics and bivariate analyses examining differences between hookah never users, current (past 4 months) users, and former users (lifetime users, but not in past 4 months)

Total sample M (SD) or N (%) N=2865Never users M (SD) or N (%) N=1614Past-4-months users M (SD) or N (%) N=354Former users M (SD) or N (%) N=897p
Socio-demographics
Age (SD)20.53 (1.93)20.31 (1.89)20.43 (1.77)20.97 (2.00)<0.001
Sex (%)0.034
Female1846 (64.4)1073 (66.5)219 (61.9)554 (61.8)
Male1019 (35.6)541 (33.5)135 (38.1)343 (38.2)
Race (%)<0.001
White1823 (63.6)1091 (67.6)170 (48.0)562 (62.7)
Black645 (22.5)319 (19.8)121 (34.2)205 (22.9)
Asian192 (6.7)107 (6.6)31 (8.8)54 (6.0)
Other205 (7.2)97 (6.0)32 (9.0)76 (8.5)
Hispanic (%)218 (7.6)111 (6.9)34 (9.6)73 (8.1)0.166
Type of school (%)<0.001
Public804 (28.1)429 (26.6)120 (33.9)255 (28.4)
Private1224 (42.7)711 (44.1)142 (40.1)371 (41.4)
Technical college516 (18.0)326 (20.2)29 (8.2)161 (17.9)
HBCU321 (11.2)148 (9.2)63 (17.8)110 (12.3)
Current other tobacco use
Cigarettes334 (11.7)78 (4.8)90 (25.4)166 (18.5)<0.001
Smokeless tobacco81 (2.8)13 (0.8)27 (7.6)41 (4.6)<0.001
E-cigarettes158 (5.5)35 (2.2)53 (15.0)70 (7.8)<0.001
LCC156 (5.4)33 (2.0)69 (19.4)54 (6.0)<0.001
Current other substance use
Marijuana357 (12.5)74 (4.6)111 (31.4)172 (12.5)<0.001
Alcohol1844 (64.4)865 (53.6)287 (81.1)692 (77.1)<0.001
Binge drinking891 (31.1)295 (18.3)179 (50.6)417 (46.5)<0.001

### Characteristics of hookah use among past-4-months users

Of the 354 past-4-months hookah users, average number of days of use was 4.53 (SD=12.43). Whereas, of the 226 past-30-days hookah users, the average number of days of use was 3.04 (SD=4.46). Among past-4-months users, 186 (52.5%) reported using hookah most frequently at a bar, followed by 116 (32.8%) who used it at someone else’s home, and 48 (13.6 %) who used it at their own home. Of the past-4-months hookah users, 316 (89.3%) used large hookah, whereas 35 (9.9%) participants used the handheld type. When asked to select three most commonly used hookah flavors, 310 (87.6%) chose fruit flavors, 107 (30.2%) selected menthol or mint flavor, and 100 (28.2%) chose candy flavors. On average, confidence in quitting hookah was high (M=8.48, SD=3.25); however, average importance of quitting hookah was low (M=2.61, SD=3.41). In addition, 261 (73.7%) reported no intention to quit, but 58 (16.4%) reported readiness to quit using hookah in the next 30 days. Finally, 93 (26.2%) reported attempting to quit use of hookah in the past 12 months.

### Reasons for hookah use among current users

The reasons for hookah use among current users assessed are listed in Table 1. Two primary factors emerged: 1) instrumentality (e.g. doesn’t smell badly, appealing flavors; Cronbach’s alpha=0.89), and 2) social reasons (e.g. people important to me use hookah, the image it reflects; Cronbach’s alpha=0.81). The reason most highly rated on average was that it comes in appealing flavors (M=3.39, SD=1.91), followed by liking to experiment with the flavors (M=2.93, SD=1.97). The lowest rated reason was liking the image that using hookah reflects (M=1.61, SD=1.30).

Bivariate analyses indicated that reasons for use did not differ by age, sex, race/ethnicity, type of school attended, or past-12-months hookah quit attempts. However, greater likelihood of reporting readiness to quit using hookah in the next 30 days was associated with lower scores on both instrumentality (M=2.32, SD=1.41 vs M=2.80, SD=1.55 for those not ready to quit, p=0.030) and social reasons (M=1.83, SD=1.13 vs M=2.23, SD=1.28 for those not ready to quit, p=0.029).

Reasons for potential hookah use among never users The reasons for hookah use among never users assessed are listed in Table 2. Only one primary factor emerged (Cronbach’s alpha=0.80). The reason most highly rated on average was that it comes in appealing flavors (M=1.37, SD=1.00), followed by liking to socialize with other hookah users (M=1.29, SD=0.88). The lowest rated reason was that people in the media or other public figures use hookah (M=1.32, SD=0.62).

Bivariate analyses indicated that reasons for potential use did not differ by age, sex, or type of school attended. However, scores for Whites were higher than for Blacks and Asians (M=1.93, SD=0.51 vs M=1.41, SD=0.84 for Blacks and M=1.43, SD=0.75 for Asians, p<0.001).

### Reasons for discontinued hookah use in former users

The reasons for discontinued hookah use among former hookah users assessed are listed in Table 3. Three primary factors emerged: 1) inconvenience (e.g. too messy/expensive, didn’t like smell, flavor, buzz; Cronbach’s alpha=0.91), 2) anti-tobacco attitude (e.g. quit tobacco/nicotine all together, it’s unhealthy, Cronbach’s alpha=0.83), and 3) social reasons (e.g. didn’t like the image it projected, someone asked me not to use; Cronbach’s alpha=0.83). The reason most highly rated, on average, was that they just didn’t think about it (M=3.84, SD=2.15), followed by thinking it’s unhealthy (M=3.64, SD=2.20). The lowest rated reasons were that someone asked them not to use it (M=2.04, SD=1.81), and thinking it was weird or socially unacceptable (M=2.04, SD=1.71).

Bivariate analyses indicated that reasons for discontinued use did not differ by age, race/ethnicity, or type of school attended. However, females had higher scores in relation to anti-tobacco attitudes or health concerns (M=3.72, SD=1.84 vs M=3.18, SD=1.73 for males, p<0.001), social reasons (M=2.61, SD=1.55 vs M=2.27, SD=1.43 for males, p=0.024), and inconvenience (M=2.48, SD=1.72 vs M=2.24, SD=1.49 for males, p<0.001).

## DISCUSSION

The purpose of this study was to identify correlates of never, current (past 4 months), and former hookah use, and to enhance our understanding of how young adults use hookah, as well as their reasons for use, potential use, or discontinued use. In our sample, 12.4% were current hookah users, and 31.3% were former hookah users. This is in agreement with other studies on hookah-use prevalence among young adults1,5,36-38.

In terms of correlates of hookah-use status, being older was associated with being a current or former hookah user, as was found in other studies of hookah uses in young adulthood39,40. Men were more likely than women to report current or former hookah use, consistent with other research39,41. Nevertheless, there is growing concern about hookah use among women, globally42,43. Evidence suggests that positive attributes associated with hookah use have promoted its use among women44. Current findings also show that there was no difference in its consumption based on sexual orientation. In terms of race/ethnicity, Blacks were more likely to be current or former hookah users compared to other races. Hookah use is common among racial/ethnic groups where it is a cultural pastime, like the Arab populations, but it is on the rise among other racial groups in the United States45. Disparities among hookah use warrant further study, with particular attention to culture, race, and ethnicity, to tailor smoking interventions. Nearly 30% of public school and 20% of HBCU students were current hookah smokers, and 30% and 10% were former users, respectively. Finally, current use of any other tobacco product, marijuana, or alcohol was associated with increased odds of current or former hookah use, which is in line with previous findings29,46.

Regarding characteristics of hookah use, most of the participants consumed the larger floor/table top at a bar, most frequently. Findings from this study are consistent with the literature, indicating that people predominantly prefer using hookah in a social setting, as it is a shared communal experience16,22, and that hookah cafes and bars are becoming popular places to socialize37. The majority of respondents used characteristically flavored tobacco products out of which fruit flavor was dominant. Their cartons are often packaged with fruit displays, making them appear as healthy products for hookah consumers47, along with advertisements that have made flavored tobacco products popular. On average, current hookah users reported that quitting hookah use was not very important. This could be because some believe using tobacco in a waterpipe is seemingly healthier, less addictive than cigarettes27, and believe they could quit at anytime28. Moreover, hookah users who are likely not to use it daily or even weekly may not consider quitting as a relevant option, as previously documented in the cigarette smoking literature48,49. In addition, not having used it in the past 4 months may not reflect volitional cessation, but could instead indicate that opportunities for hookah use may not have presented themselves or just an unintentional lapse in use.

Overall, current hookah user responses reflected consistency with previous research on reasons for hookah use23,24,26,43, highlighting instrumentality (e.g. doesn’t smell badly, comes in appealing flavors) as the most significant reason, followed by social reasons (e.g. people who are important to me use hookah, I like the image it reflects). The availability of various flavors along with experimenting with them was a primary reason for hookah use among current users. Never users mentioned the appeal of assorted flavors along with socializing with hookah users as their main reasons for potential use. Social reasons given in past research are that hookah smokers have a strong peer influence in initiation and imitation of the behavior16,31, and that students who smoke hookah have a greater number of friends who approve of hookah compared to never users17. Additionally, it is an affordable way to socialize16,18,21,22, appears cool and trendy12-14,50. These findings add to previous research examining hookah use among young adults, which documented that the constructs from the theory of reasoned action were all correlated with smoking behavior, and that use-related beliefs of users were more strongly associated with hookah-related attitudes compared with subjective norms38.

It should be noted, however, that average ratings for each of the reasons for use among current use were below the mid-point (i.e. less than 3.5 on a 6-point scale), and that average ratings for the reasons for discontinued use were largely below the mid-point. These findings might indicate that there are other dominant reasons for use or discontinued use that were not assessed or that participants had little insight regarding their reasons for use or discontinued use. Moreover, never users rated each of the reasons for potential use quite low on average (≤1.37 on a 6-point scale), which may reflect similar phenomena or that never users are highly resistant to use on average.

Discontinued or former hookah users mentioned inconvenience of mess, cost, smell, flavor, or buzz, and anti-tobacco decisions to quit tobacco and nicotine all together, or found it unhealthy. Another emergent reason to discontinue smoking was social reasons – people didn’t like the image it projected or were influenced by someone asking them not to use it. This finding is in agreement with past research, when family and friends’ disapproval is a reason to stop smoking51,52. Indeed, the majority of waterpipe smokers are interested in quitting for social reasons51,52.

Findings from this study have implications for future research and practice. In terms of research, studies should focus on ways to effectively deliver messages to correct misperceptions about hookah, taking into account the acute/immediate and chronic/delayed consequences of using these products. There is a need to assess the impact of availability of various tobacco flavors within this population, as well as its role in hookah experimentation and progression to established use over time. Regarding practice, the findings of this study have implications for FDA regulations regarding hookah use. Since the majority of the participants liked the variety of tobacco flavors for hookah, flavor restrictions similar to those implemented for cigarettes under the Family Smoking Prevention and Tobacco Control Act may reduce the appeal of these products to them. University and college campus health-promotion initiatives should seek to promote positive health behaviors, and anti-hookah smoking efforts. Moreover, bolstering the social influences and other motives for cessation may be critical in curbing the hookah-use trend in young adults.

### Limitations

Limitations to this study include limited generalizability of the findings due to localized recruitment, from colleges and universities in the Southeast region of the United States. Additionally, given the self-report nature of the assessments, findings are subject to bias. Finally, it is possible that we failed to tap some dimensions of the reasons for hookah use, potential use, and discontinued use; further research is needed to ensure exhaustive assessments of such dimensions.

## CONCLUSIONS

The results from this study illustrate the widespread use of hookah among young adults. In particular, some young adults (those who are older, male, and Black) are at higher risk of hookah use. Moreover, young adults using other tobacco products, marijuana, or alcohol are more likely to use hookah. Among current users, there was low motivation to quit. We also documented reasons for using hookah among the current users and potential reasons for use among never users. Instrumentality and social reasons were the main factors for using hookah: mainly it does not smell badly, they enjoy experimenting with the variety of flavors, people close to them smoke hookah and the image it reflects. Particularly novel, we documented reasons for discontinued use among former hookah users. Discontinued or former users quit hookah use because they quit tobacco and nicotine all together, find it unhealthy or expensive, and due to the inconvenience of mess, smell, taste, or buzz. The variety of appealing flavors and socializing motivated the never users to potentially use hookah.