how many cigarettes a day is Heavy Smoking? Know the Figures how many cigarettes you smoke

His bulls mouth is not made for human words, so verbal communication is an onerous task: His economy of language and the obvious embarrassment he feels when attempting to speak make his few non-grunted utterances poignant, not piteous (there's an exchange with M and his boss that crescendos with M's submissive, disbelieving "Not fired?" and, I swear, those paired words have never sung with such emotional resonance before)

BMJ 2019 Sep 30;366:l5275 Limited utility of detailed e-cigarette use measures: an analysis of NESARC-III

Oh, here it is

Your brain has gotten used to the nicotine in cigarettes, and it will send you the message that you need more of it

Case closed