Useful Links
Al-Anon Family Groups (Al-Anon is another 12-step program that, while traditionally geared towards those affected by a loved-one's alcoholism, is also welcoming of anyone affected by marijuana addiction. It is also a fantastic resource for literature.)
Literature
Mar-Anon Meeting Guide (In-Person)
Mar-Anon Meeting Guide (Chat)
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Mar-Anon Meeting Guide (Phone)
For the Loved Ones of Marijuana Addicts (courtesy of marijuana-anonymous.org)