He is robbing you and your children of the life you deserve. That shows he cares more about his simplistic desires than what the whole family needs to be happy, healty and strong. He might get better, but he probably won't change, you need to decide if it's worth it or not. You know, pot destroys some of the brain that causes people to be empathetic and that's not something that's helpful to a relationship. It makes you have to be the "grownup" , the "mother" and it's not fair at all. Is he responsible at other times and in other situations? Does he help you with the kids? You have to weigh all this carefully and decide if it's an overreaction or not.
Of course, all the people who smoke pot regularly are going to support it, so don't let that fool you. If he was addicted to watching tv non-stop instead of being there for you, what's the difference? It's disconnecting from the family and from the spouse, pure and simple. From what I've read of your posts, you sound like too much of a caring, interesting person to have to live in that situation by choice.
Alcoholism is one of the most selfish diseases (not to discredit the pain of the alcoholic) there is and everyone suffers. Let alone, it has to be hard for you to be around pot or alcohol, even moderately considering your past problems. I wouldn't stand for it at all. Kids know way more than you think and he obviously doesn't care that he's not being mature or responsible.
Can you take a temporary vacation and get away? Can you move in with a friend till he decides if he's going to take you seriously?
I wrote that rather quickly and emotionally because I've been in that situation and it's very hard to "talk" or work through things with someone who doesn't give a damn and just wants to float through life without any cares or goals in life. My husband almost died due to heart complications and the doctors told him they were brought on by drugs (including pot). HE stopped cold turkey (even though I had begged for a couple of years prior) and he has changed into a much more mature person over the years. It's too bad that nothing else seemed to be enough to make him quit. But, at least he's seeing how much more interesting life can be without added stimulants.
I hope for the best for you,
Anne
"When caught between two evils I generally pick the one I've never tried before." Mae West