Robert West, professor of health psychology and director of the Tobacco and Alcohol Research Group at University College London, previously wrote in The Independent : Whatever you do, make sure you follow the instructions and use enough that is the classic mistake that most smokers make

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Safe is however a relative term, so its absolutely worth reiterating: these products contain nicotine, and are intended solely for use by adults, as an alternative to smoking and as a smoking cessation aid
Secondhand smoke exposure has a negative health impact too with 41,000 deaths per year making secondhand smoking 11.7 % of total cigarette deaths