RE:RE:Simon's ExplanationsYes, anyone can grow a weed and smoke it and those happy doing that will do so. Those who prefer to make their own beer etc also do the same. The thing is that the majority of pot users do not do it, nor the beer drinkers.
Cannabis products such as medical grade cannot be substituted with black market. Quality cannabis drinks also can't be supported by black market due to the equipment needed to make it
Black market alcohol didn't go away after prohibition lifted, it's still around, however the majority of consumers shifted to legal as the quality was higher and more consistent.
The projected market growth for cannabis is positive, that growth would consist of both new medical users as well as new users it will also include some amount (small or large) of pot smokers moving from black market product to legal.
Just Google "projected cannabis market size" there's tons of info out there