When Cannabis Advances, Alcohol Retreats (Again)

Yet another study adds to the growing body of evidence that cannabis and alcohol are at least partial substitutes.  When cannabis advances, alcohol tends to retreat, as seen in many studies.  That seems to be true both in Canada (18 or 19 depending on the province for both, except 21 in Quebec), and in the USA (21 for both, and cannabis legal only in some states).