I'm going to ask my boyfriend to not drink or smoke in front of me
What is it about his habits that you don't like?
The smoke makes my clothes smell and he is obnoxious when he drinks.
I can understand why you would think that way. It is rude to do things that make other's uncomfortable. You should tell him your feelings so that he will understand how you feel.
I don't even talk to him, it's just his sisters.
Well it would be good for you to talk to him and let him know how you feel. Maybe he can switch up his behavior so you are more comfortable spending time with him.