zvei dinim: Not me, Poe’s. (As in Poe’s Law).
Meaning, if I were a smoking Yeshiva Bochur (which I am not), I have not been convinced. Oomis & others are aware from other threads what I feel about smoking.
Until real yeshivas (and not “some yeshiva in Manchester (UNITED! Go Red Devils!!!)”, but Brisk, Mir, Lakewood, Ponevitch, etc.) treat smoking like unfiltered internet use, nothing will change. And that is why people think it is muttar, no matter what proofs, p’sakim, or pashkevels you bring. It is treated differently, so it is thought of differently.