Efficacy of e cigarettes for smoking cessation in populations with psychiatric and or substance use problems: A secondary analysis of a randomized controlled trial High End le haut de gamme de la vape Just published the first randomized controlled trial of varenicline for vaping cessation CoEHAR Smoking Cessation Programs Are Less Effective in Smokers with Low Socioeconomic Status Even When Financial Incentives for Quitting Smoking Are OfferedA Community Randomized Smoking Cessation Trial in Denmark