This is what a medical-marijuana class looks like. Twenty-five or so students — men, women, young, middle-aged — listen attentively as an instructor holds up a leafy green plant and runs down the list of nutrients it needs. Nitrogen: stimulates leaf and stem growth. Magnesium: helps leaf structure. Phosphorous: aids in the germination of seeds. Michigan's Med Grow Cannabis College is one of several unaccredited schools to have sprung up in the 14 states and the District of Columbia that have legalized medical use of marijuana. Many of its students suffer from chronic pain. Others are looking to supply those in need of relief.

time.com