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The ethics of conducting observational tobacco research without providing treatment to people who use tobacco: a case example from South Africa BMJ Global Health Health Benefits from Stopping Smoking International Society of Substance Use Professionals Harms and benefits of e cigarettes and heat not burn tobacco products. A literature map HRB Health Research Board Cross country comparison of waterpipe use: nationally representative data from 13 low and middle income countries from the Global Adult Tobacco Survey (GATS) Tobacco Control

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