are police officers allowed to smoke cigarettes Smoking and Law Enforcement: The Hidden Hazards of Being a Cop Police man smoking a cigarette
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In the year up to April 2015, two out of three people who used e-cigarettes in combination with the NHS stop smoking service managed to successfully quit

Any calming effect is just temporary relief from nicotine withdrawal symptoms, not genuine relaxation
[PubMed] [Google Scholar] 35.Strasser AA, Cappella JN, Jepson C, et al

The act of vaping also closely replicates the feel of smoking, from the inhale, to the hand to mouth action, so it not only offers an alternative nicotine source but also helps replace the physical act of smoking

For smoking, for instance, individuals will have quit if they have gone seven years without a cigarette, explains David Gortler, former senior adviser to the FDA commissioner on policy and drug safety

If that connection gets corroded or loose, the circuit is broken