There are about half a dozen studies around the world that have proven cannabis is and can be used to treat addiction from alcohol heroin as well as prescription drugs, unfortunate our governments are determined to cave in to pressure from the pharmaceutical industry and their profit margin. This isn't about health, its about money and who makes it.
 Marijuana Treats True Addiction From Pharmaceuticals, Depression and Social Anxiety  http://www.naturalblaze.com/2016/11/marijuana-treats-addiction-pharmaceuticals-depression-social-anxiety.html
Marijuana To Control Alcohol Abuse    https://psychcentral.com/news/2009/12/01/marijuana-to-control-alcohol-abuse/9863.html
Cannabis Has Stunning Success Fighting Alcoholism   https://cannabis.net/blog/medical/cannabis-has-stunning-success-fighting-alcoholism
Can Marijuana Help You Quit Cigarettes? Study Says Yes       http://www.leafscience.com/2013/11/01/can-marijuana-help-quit-cigarettes-study-says-yes/