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I've heard of this before, and am also somewhat familiar with use of cannabis to alleviate symptoms of opiate withdrawl.
One of the most common reasons people become habitual in terms of other dependencies is self-medication, and anxiety/social anxiety is classic. Now, we all know how effective cannabis can be against anxiety, so it stands to reason that if you lessen the symptoms of the disorder that incites people to seek relief by using more harmful drugs, you can also diminish their use of those drugs.
I was wondering why I had such a hard time quitting smoking cigarettes again recently...then it dawned on me that last time I was smoking pot to deal with the psychological and physical withdrawal effects..after the next whiz quiz I'm going to kick them out of my life once again..hopefully this time for good...Can't do it cold turkey without cannabis though...takes way too much of a toll on my mind and body..