I don't think you should be worried about the drinking, unless he's getting drunk a lot. My boyfriend started drinking a lot for a few weeks to manage pain because his medication wasn't working. It was rough, and he knew I wasn't comfortable with it. He stopped on his own and only drinks once a week usually now because he realized it was costly. Men are stubborn. If you've made your stance clear, I think it's best to ignore it as much as possible and let him handle it on his own.
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An ongoing experiment in a primal family...