There's something called the marijuana maintenance plan that alcoholics like myself have tried to kick the booze.
The logic (in my mind) is that pot isn't as harmful physically as alcohol. It doesn't cause all that liver damage and such, plus no hangovers.
In the end, for me, I wound up going back to alcohol. Pot was just a replacement drug that didn't solve anything for me. I still exhibited all the same addict behaviors and had all the same problems. It didn't solve anything. Though at the time I thought it was a solution.
The big downside to the grass is the potential legal consequences. Laws vary widely by state. In MN, it's no worse than a traffic ticket, $100 fine. You're not arrested unless you have a large quantity in your posession. Other states aren't so liberal.