@article {Nguyentobaccocontrol-2020-055705, author = {Hai V Nguyen and Stephen Bornstein}, title = {Changes in adults{\textquoteright} vaping and smoking behaviours associated with aerosol-free laws}, elocation-id = {tobaccocontrol-2020-055705}, year = {2020}, doi = {10.1136/tobaccocontrol-2020-055705}, publisher = {BMJ Publishing Group Ltd}, abstract = {Objectives Banning e-cigarette use in public places has attracted considerable debate, with governments adopting different policies. However, little is known about the outcomes of such bans. We investigated the association of banning e-cigarette use in public places and workplaces in Canadian provinces with adults{\textquoteright} vaping and smoking behaviours.Design Difference-in-differences.Setting Nationally representative Canadian Tobacco Use Monitoring Survey (CTUMS) and Canadian Tobacco, Alcohol and Drugs Survey (CTADS).Participants Adults aged 19 and older from CTADS 2013{\textendash}2017 for e-cigarette outcomes (N=36 562) and from CTUMS/CTADS 2004{\textendash}2017 for combustible cigarette outcomes (N=178 654).Interventions Bans on e-cigarette use in public places and workplaces in Canadian provinces.Main outcome measures Past 30-day e-cigarette use, current combustible cigarette use, use of e-cigarettes when unable to smoke combustible cigarettes.Results After the bans, e-cigarette use in the past 30 days did not change significantly in provinces with a ban compared with provinces without a ban (0.004; 95\% CI -0.025 to 0.032; p=0.783). The bans also had no impact on current combustible cigarette use (0.009; 95\% CI -0.019 to 0.037; p=0.488). There is evidence of ban evasion among young people aged 19{\textendash}24 who, after the bans, reported higher use of e-cigarettes when unable to smoke combustible cigarettes (0.114; 95\% CI -0.023 to 0.250; p=0.092).Conclusions Two years after implementation, the aerosol-free laws in Canada had no impacton adults{\textquoteright} vaping and smoking behaviours. Policy efforts are urgently needed to improve the ban enforcement and to deal with discreet vaping among young adults.}, issn = {0964-4563}, URL = {https://tobaccocontrol.bmj.com/content/early/2020/09/15/tobaccocontrol-2020-055705}, eprint = {https://tobaccocontrol.bmj.com/content/early/2020/09/15/tobaccocontrol-2020-055705.full.pdf}, journal = {Tobacco Control} }