Within 5 years marijuana will be widely legalized just as gay marriage will be institutionalized and widespread. Today’s tobacco companies will be growing and processing pot which will be heavily taxed. The progressives will then be demanding legalization of heroin, meth, and consensual sexual relations between adults and children as well as adults and animals.
Fast forward 30 years. Progressive ambulance chaser lawyers will be filing class action suits against the pot/tobacco companies demanding big settlements for throat cancer caused by smoking weed or brain damage caused by dependence on pot. They’ll also be suing the Boy Scouts to allow consensual sex between troop leaders and scouts during campouts.
The envelope will keep getting pushed until we have anarchy and total destruction of the social fabric. From there civilization will have to rebuild.
Too many people say "The case load at the county courthouse would be easier next month if we stopped prosecuting people for drugs". That sort of short-sighted thinking is why we're in a mess. We give in and give in and give in on all of our principles (moral society being a key principle) and then we get upset that everything is in decline.