"the wages of sin are death" so yep smoking cigarettes is a sin because it hurts a person even to the point of death just the same as sin.
All sin leads to death. The main one being rejecting Jesus and his forgiveness is sin.
Paul addresses in Romans with regards the weaker brother and eating food sacrificed to idols. Some thought it was sin.
So to them those who did eat such meat were sinning.
Did Paul say such who Do were gonna end up in hell?
Some denominations say drinking alcohol a sin.
If so are believers who like an alcoholic beverage going to hell?
Do you know what hurts a person, what has the power to bring death to a person.
OUR TONGUE.
Proverbs 18:21
21 Death and life are in the power of the tongue,
And those who love it will eat its fruit.
I would rather be with a believer who smokes yet loves people than one who doesn’t Yet has a spiteful condemning tongue.