E-cigarette and cigarette purchasing among young adults before and after implementation of California’s tobacco 21 policy
Sara Schiff, Fei Liu, Tess Boley Cruz, Jennifer B Unger, Sam Cwalina, Adam Leventhal, Rob McConnell, Jessica Barrington-Trimis
Tobacco Control Mar 2021, 30 (2) 206-211; DOI: 10.1136/tobaccocontrol-2019-055417