smoke weed...?

My boyfriend and I just had a conversation about smoking weed. He has a lot of friends who smoke weed and he was telling me that at the Halloween party, he might also smoke a little. He has smoked weed before but has never done it since we started dating. He asked me what my opinions were. I straight up told him that I don't like that. Of course he asked why, and i just told him because it's illegal. He started giving me this lecture on how smoking weed occasionally won't really affect your body and smoking weed gives you this psychological benefit that nothing else will give you. I said I understand and I know that it's not bad comparing to being addicted to anything, but I just hate it. I said, "I don't want to tell you what to do or what not to do, but I think if you love me enough, you should value my opinions." He said I'm close minded, and I agreed, but I just can't like what he wants to do! 

What do you think? I don't even know what to feel now. 😞