years ago I was seeing a guy and about 3 months into dating I found out about his tina use. I wasn't at all pleased. I told him I didn't care what he did when he wasn't around me as long as it didn't effect or affect being around me. within that month he canceled 3 dates, 2 of which I nknow were after effect of his partying. I said see ya.
over the next 3 years I'd heard he lost an awesome job at a major network, his car and his nice apartment. I saw him late one afternoon, quivering, filthy and looking gaunt. He didn't recognize me.
but there is a better ending. a couple years later I ran into him, clean and sober for near a year. We exchanged numbers and a few phone calls but that's where I've left that involvement.
Perhaps, had I been around things for him may have been different those several drug years, but probably not ( I'm kind of a rescuer - and learned not to be a martyr about that).
about the only drugs I tolerate, and only in social moderation are pot and alcohol.
Life's way to short to and much too interesting to go through it high.