This question comes up a lot and will probably continue as it seems to be gaining more acceptance and has been legalized in some places. But then again alcohol is legal too and it is a problem for millions of people. I think if you have to ask the question about marijuana you probably already know the answer. I had several years of sobriety from alcohol (my drug of choice) but I got hooked on opiates after major surgery and some complications. Within a year I was back to drinking. At first just a couple beers a night to give the pills a bit of a "boost". I got off of the pills after a couple of years, but 8 years later I am just getting sober again from alcohol.
I'm not saying you can't quit one drug at a time, just sharing my experience that getting addicted to pills led me back to my alcohol addiction.