What if I ask my boyfriend to tell his friends to not smoke out around me? I want him to lose those friends that keep disregarding my severe allergies.
Sounds like the smoke really affects you.
Yes, I don't like the smoke and the disgusting smell
That's understandable, especially if you have an allergy. Your boyfriend should make your safety a priority. If he can't understand that, maybe you should reconsider the relationship.
Fine, I'm going to break up with him.
Your first step should be to sit down and respectfully talk to him about your concerns. If he loves you, he will understand and act accordingly. If he blows you off, then it might be time to reconsider the relationship.