The unique contribution of e cigarettes for tobacco harm reduction in supporting smoking relapse prevention Harm Reduction Journal Springer Nature Link PDF) Reported patterns of vaping to support long term abstinence from smoking: a cross sectional survey of a convenience sample of vapers Efficacy of Electronic Cigarettes for Smoking Cessation: A Systematic Review and Meta Analysis Shorouk Ibrahim, Mohamed Habiballah, Iman El Sayed, 2021 Nicotine e cigarettes for smoking cessation following discharge from smoke free inpatient alcohol and other drug withdrawal services: a pragmatic two arm, single blinded, parallel group, randomised controlled trial The Lancet Public Health