I had an abortion when I was 18, one year before conceiving my older child. One of my biggest regrets, besides even being with her father LOL
Drugs in most cases don't discriminate, kids or no kids it wouldn't have stopped. My parents have been drug users since before I was even born and still use, they are in their 60's and have no plans on stopping.
So wise choice on getting life in order before kids, cause coming from a kid who had to live with drug abusers, it's not a lovely lifestyle or will keep them in the best mental state.
It takes a bigger person to wait and in due time.
In due time, everyone gets their hearts desire, or their due.
or so I had ingrained into me by my non-drug using grandparents.