Far from being the 'Entrance Drug' of myth, cannabis is in fact a very powerful 'Exit Drug' from addictions, both alcohol and drug related. In fact it appears to be the most promising way we have to confront the growing opioid addiction crisis in North America.
Some of the Published Research
Substituting cannabis for prescription drugs, alcohol and other substances among medical cannabis patients: The impact of contextual factors - 2015 - http://onlinelibrary.wiley.com/doi/10.1111/dar.12323/abstract
The endocannabinoid system regulates synaptic transmission in nucleus accumbens by increasing DAGL-α expression following short-term morphine withdrawal. - 2014 - http://www.ncbi.nlm.nih.gov/pubmed/25296881
The lifestyle drug-substitution strategy: a radical alcohol policy - QJM 2005 - http://qjmed.oxfordjournals.org/content/98/6/457
Article from Medical Jane: Jan/15 - Cannabinoid Therapies for the Treatment of Alcohol Dependence - http://www.medicaljane.com/2015/01/10/cannabinoid-therapies-for-the-treatment-of-alcohol-dependence/