hello i am also i sad bean :') i hope you feel better, i'm sad because well i'm just always a little sad but that's okay. I do online school because humans are j*rks and i don't talk to people much and don'y worry families are always a little mean but it's just preparing you for all the idiots in the world when you grow up (or if you go to public school then the stupid idiots that may be in your class) hope you feel a little better fellow human :) (also i put a star in jrks because it said it was profane language lol)
If they ask if you want to smoke, simply say no. If they don't respect your decision or try to force you, then call a trusted friend or adult and leave
The best answer to fill in the blank would be ''Bystander'' because as that role you can go tell any adult or higher authority to stop the fighting so you don't try to be a hero and get yourself hurt as well.