did pope francis smoke cigarettes stubs out cigarette sales inside the Vatican Smoke at the Vatican: How

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Cigarette-related fires are difficult to classify without video surveillance or locating the actual cigarette, according to Marino, who said many of the undetermined fires could have easily been linked to careless smoking

Scientists do think that repeated nicotine use can cause the nicotinic acetylcholine receptors to become less sensitive over time, which has been shown in research, and that your brain may actually create more of them as a response

[Google Scholar] Hurt RD, Sachs DPL, Glover ED, Offord KP, Johnston JA, Dale LC, et al

It usually goes away by itself, but sometimes it leads to other diseases