How do you tell your boyfriend you don't like him smoking weed?

My boyfriend has been smoking week for about 4 years now and we met because I also smoked a lot. Sense then I have stopped becuase I don't like who I am while smoking, and honestly I'm not the biggest fan of who he is while high either. Should I tell him, if so how?
Tell him
Don't tell him
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How do you tell your boyfriend you don't like him smoking weed?
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