I'm glad you're out of that situation YH. It's not a matter of judging people who do drugs, it's just that it pulls you into the very unhealthy lifestyle they live. Don't forget this woman is driving around doing deals and using while her children are being raised by strangers.
When you move, start again. Maybe hang out with people who have healthy lifestyles. You'll find them in all sorts of activity clubs.
Hope you can cut back on the drinking now you don't have her to trigger it.