Effectiveness of a chat bot for the adult population to quit smoking: protocol of a pragmatic clinical trial in primary care (Dejal@) BMC Medical Informatics and Decision Making Springer Nature Link Are 'dual users' who smoke and use e cigarettes interested in using varenicline to stop smoking altogether, and can they benefit from it? A cohort study of UK vapers BMJ Open Comment nettoyer un clearomiseur ? Neovapo Programs and policies to discourage the use of tobacco products Oncogene