The simple reason that it's illegal an looked down upon is the smear campaign launched decades ago by companies led by a paper manufacturer (3M, I think) who realized that hemp rope, hemp paper, and hemp oil would make synthetic rope, wood pulp paper, and other natural oils inefficient and dominate the market. Suddenly, a car accident after which marijuana was found in the car would be on the front page for days, lobbyists bombarded congressmen with anti-cannabis propaganda. All cannabis, even those strains that contained a negligible amount of THC (it would take a bushel to equal one medium-strength joint) were outlawed. The fear of "Reefer Madness" (the title of a propaganda film produced with the influence of the US government) struck America, and suddenly parents worried that their kids could succumb to the temptation of the evil plant.
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