Marijuana Anonymous is a fellowship which aims to deal with the emotional, physical and mental consequences of addiction to marijuana. It utilizes the 12-Step program, as developed by Alcoholics Anonymous. Marijuana Anonymous operates as a spiritual program, not one of psychology.
The 12 Questions of Marijuana Anonymous
The following questions may help you determine whether marijuana is a problem in your life. If you answer yes to any of the questions, you may have a problem with marijuana according to the group.
Has smoking pot stopped being fun?
Do you ever get high alone?
Is it hard for you to imagine a life without marijuana?
Do you find that your friends are determined by your marijuana use?
Do you smoke marijuana to avoid dealing with your problems?
Do you smoke pot to cope with your feelings?
Does your marijuana use let you live in a privately defined world?
Have you ever failed to keep promises you made about cutting down or controlling your dope smoking?
Has your use of marijuana caused problems with memory, concentration, or motivation?
When your stash is nearly empty, do you feel anxious or worried about how to get more?
Do you plan your life around your marijuana use?
Have friends or relatives ever complained that your pot smoking is damaging your relationship with them?

More info, help links & Source:
http://en.wikipedia.org/wiki/Marijuana_Anonymous