Based on you other post in a different thread, I highly doubt you're of perfect mental health, and think you still have a lot of work to do in that department. I'm referencing the post where you talked about how you have drugged your wife without her knowledge so you can have sex with her all night. This is not an action of somebody that is mentally healthy, regardless of how you may rationalize the action. You cited other examples as well, but I'm not going reference other posts as the example above is enough.
If you are not ready to quit drugs, it may be healthier for your wife and kids if you do leave. Your actions are volatile and self serving, and I think you have the capacity to injure someone if you feel you are pushed enough. Aside from that, your kids are picking up on your feelings, so when you're bored and frustrated when you have to watch them, they know. You're wife is most likely also aware that you are still using, regardless of what you tell her as I doubt at this point there is much trust there.
I'm not going to push sobriety on you as I don't think you are being honest with yourself regarding your mental state, and will only comment on your family as I am concerned for them and their emotional well being.