I started smoking age 14, Ottawa, 1964.  Busted for growing it in 1972, Ontario.  Medical marijuana patient now, in California for the last five years or so.  California just legalized recreational use, so it's a hot topic down at the dispensary.  Few in the Medical Marijuana growing business are looking forward to the invasion of Corporate America, with it's warehouse sized operations.  Rules and regulations for growing the stuff are piling up, now far beyond the trouble any local grower would want to be involved in.  Oddly enough the small growers and black market are surviving.  You can grow all you'll ever need at home, and ignore most of the commercial market.  Just go there for special occasions.