HELP!!!

I met this guy online and we have been talking for months but haven't met on person yet. He smokes pot and I don't and if I was to date him I would rather he didn't. But he is the sweetest guy I've met in a long time and makes me smile every minute of every day. We had a chat about the smoking situation yesturday. And I asked him if he really liked a girl and she didn't like that he smoked if he would quit for her. He said he really likes me a lot but he prob wouldn't stop smoking. To my suprise it really broke my heart,( I actually broke down and cried) I was deffinately hoping for a different answer. I still really like him but don't know what to do. Opinions??