Smoking Is 100% assur. No heter whatsoever. R` shmuel kaminetzky said there is no heter for purim and it is a yom simcha so please keep that way.
other rabbomim include
R moshe
R elyasiv
R yitzchok zilberstein
The steipler
R chaim kanievsky
and a lot more rabbonim
r moshe shterbuch paskened it is assur that they will beemes make a gezeirah about smoking, but ein gozrin gzeirah al hatzibur shein rov hatzibur yochul laamud buh
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