In my opinion, your friend just wants to blame everything on you. he doesn't want to feel guilty and ostracized by others just because he smokes and drinks. therefore, he blames you for everything. and automatically people will glance at you and blame you.

from your story, it was he who forced him to smoke, not you who forced him to smoke. if you force other people to smoke of course you are wrong and must be responsible. but this is not your fault. because, he himself wanted to smoke.

sometimes advising people who are drunk and smoked is a bit difficult. because their minds will only be directed to smoking and drinking.

but in my opinion, everyone can definitely change to be even better than before. while he is still given time and life.