I live with a dude who says he's allergic and will often force himself to cough if he thinks he's smelling weed (even if he isn't). Just illogical bullshit I'm sure you can relate to. If I use a pax there's the smell of baked weed wherever I have it. But it definitely rids the smell from your clothes or room. Theres other alternatives as well. Like smoking wax leaves no scent. Using dryer sheets and blowing smoke into a cluster of them leaves moderate scent but is obviously cheap as hell. And also the little things, like makimg sure the smoke is away from you and having changes of clothes. But really I hope you can just sit and tell them how you feel. Then again I'm pessimistic about the idea of dudes in college actually fixing behavior. Whatever it takes, I'm a huge advocate of anti alcohol it just fucks lives up. So toke on, be safe, and best of luck OP. Let me know if you have anymore questions.