What many haven't bother to learn or consider is that the marijuana of 2017, and recreational products derived from it, in no way compare to what was available to the public in the dear, dead 1960s.  New plant strains and especially, the latest THC extraction methods, now make economically feasible (cheap) products with much higher potency.  We presently regulate or outright prohibit the sale of booze or ethyl alcohol products approaching 200 proof, so do we really want to encourage the free consumption of yet another potent chemical by Americans without a lot more study and sober consideration?