Did I do the right thing?

I feel you did the right thing. We are asked in the bible how can light and darkness co exist. My answer is not too easily. Not if you are attempting to follow God. If we are open to God and his conviction we will feel some degree of unease if we are involved in sinful behaviour. The fact that people experiance pleasant effects doesn't negate the damage it does not only to themsleves but to those who love them and depend on them. It is good to express your sincere concern and committment to pray and in what ever way convey that you still love them. Also realize this could be the voice of their addiction speaking. When they say they want to they maymean they feel the need to.