Is smoking tobacco considered a form of suicide?

No.  Suicide is the act of killing yourself.  So, until you die, suicide has not occurred.

I would classify it as profaning the Temple of the holy Spirit in a matter that contributes to your death.

long term.............................

only by those who think

🥴 No more than drinking alcohol and taking prescription drugs or vitamins, otc drugs.

Eating red meat or meat period.