Why is he so concerned for me?

My boyfriend smokes weed a LOT. I've never tried it, but I want to, and when I told him that I wanted to smoke with my friends he got upset, stating that he doesn't agree with it and doesn't want me to do it. He didn't even give me a reason for why I shouldn't.

Is this hypocritical of him? I don't understand why he's so concerned about me smoking when he does it all the time. It shouldn't be that big a deal, right? What should I do?
Why is he so concerned for me?
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