How can I get my boyfriend to stop smoking cigars and pipe?

muchacho
I didn't know whether to put this in relationships or health so I went here. My boyfriend who is 18, "causally," smokes. He smoked cigarettes(but told me he would stop yesterday. He now smokes things like cigars, but he's been relying on pipes, stogies, and goes the the hookah lounge too. I mostly think its because of friend of his from Texas came to town. It it's been really bothering me because it was almost every night this week. I want him to quit, but I realize that is not right to ask of him. I told him I'm fine with casual smoking as long as it isn't around me and its not too often. But I've just been having nightmares about him being sick or something. Nightmares of me trying to talk about it and him getting mad. I'm very insecure about being annoying and I don't want to be like that control freak girlfriend. But I've done some research and apparently, they're just as bad as cigarettes. I'm so worried this boy if going to be addicted and have problems later in life. I really see him as a Hoyt that I can stay with for a very long time and he sees that too, but I'm so worried about him getting sick and dying. Sometimes I don't know what I'd do without him. He's a diabetic so I already worry enough because does not check himself too often. I'm so worried, I want to talk about it to him, but I don't want to be too over bearing and controlling and drive him away, but I'm really concerned for his well being if he gets addicted. Even if I'm not with him in the future, I don't want him to go down that road. I'd be fine if he was a casual smoker, but casual smoking to me if every few weeks or months, not every night on a weekend your were supposed to spend with me. How do I talk to him about this?
Updates
+1 y
We've been dating for seven, almost eight months and he haven't really fought at all, just gotten irritated with each other. I don't want this to be something to fight over and push him away. Guys, how would you feel if your girl asked you this?
How can I get my boyfriend to stop smoking cigars and pipe?
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