You’ve been very brave for carrying this habit around for years, for your husband. Sometimes for the sake of love and stability, we put up with so many things in our partners – some are reasonable and possible but some we make us lower our own standards of living.
If you have the resources to seek an alternative path, I would say separate and don’t let the remaining years of your life be spent in resentment witnessing something that is killing you everyday. It’ll be hard but staying with a partner who is absent isn’t any better.
I have suffered with a similar partner for 8 years, and now that we have a child he has gone to doing cocaine once a week along with marijuana every night before sleeping. The marijuana was still affordable but the cocaine has eaten our money, our life, our minds. I love him, he’s the only man I have ever been with, but I had to get perspective and a grasp of reality – the harsh truth that my husband has an addiction, and I can either spend my whole life hating and loving him and being suspicious or invest that time in making my life and my child’s life better.