The prevalence of daily smoking among youth at Danish vocational schools is 37%, while the prevalence among high-school students is 12%. Tobacco-Free-Schools (TFS) are schools with a policy that prohibits the use of tobacco products by anyone. This includes students, staff, and visitors, on school grounds or at school events at all times. This policy may be effective in re-ducing smoking among both students and staff. However, there have been few smoking preven-tion interventions implemented so far at Danish vocational schools. Further, a recent study demonstrates that smoking among students and staff has been found to be beneficial for socializ-ing and bonding, and staff and managers may be reluctant to implement TFS. The shortage of previous interventions, along with the study findings, indicates the need for a broad approach if TFC policies are to be successfully implemented in Danish vocational schools. Thus, The Dan-ish Heart Foundation, The Danish Cancer Society, and Steno Diabetes Center Copenhagen are running a multi-component intervention targeting both students and staff, with a goal of prepar-ing, implementing, and embedding TFS in nine vocational schools. The project will run from 2018 to 2020 and is funded by The Danish Health Authority.