Measuring the impact of state and local Tobacco 21 policies in the U.S.: A longitudinal study of youth and young adults ages 15-21.

This research evaluates state and local Tobacco 21 (T21) policies in the US longitudinally, finding that T21 policies are not sufficient to stem e-cigarette use among adolescents and young adults. These findings support further policy action and suggest that local and state T21 policies are not sufficient to reduce tobacco use and rather, need to be part of a broader, more comprehensive set of tobacco control policies. Further research on enforcement and implementation challenges of T21 policies, and the impacts of the new federal T21 policy is warranted.