Smoking

I think it's disgusting and it pisses me off that my fiancé enjoys smoking cigars. He used to smoke cigs before we met and he has had one every now and then but it always makes me so angry. I think it's gross and is just so incredibly unhealthy. I dont understand how anyone can do that to themselves knowing how bad smoking is!! We just got in a fight because he feels like I'm telling him what to do so he's "asserting his freedom" by continuing to have a cigar every once in a while. Am I overreacting?