how to protect yourself from cigarette smoke Fire safety tips for smokers How to Protect Yourself From
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Your body also builds up a tolerance to nicotine quite quickly, forcing you to smoke more cigarettes more often and locking you in a cycle of addiction before you realise it

They found that 60% of nicotine-free e-liquids which were purchased from best-selling retailers still contained nicotine
doi:10.1093/ntr/nts017 pmid:22387990 Bachhuber MA, Hennessy S, Cunningham CO, Starrels JL (2016) Increasing benzodiazepine prescriptions and overdose mortality in the United States, 1996-2013

Nicotine is very addictive, and everyone smokes for their own reasons