CNN Weed Dr. Sanjay Gupta Reports April 25, 2015 04:38:00
Takes some of this, and they're going to go into the negative effects of the high, the psychosis, the irritation, irritability, paranoia, all of this. >> while not all the plants are this high, there's no question he has seen a trend. in 1972 the average potency was less than 1% thc. now it's nearly 13%. >> are people becoming more obsessed with high thc marijuana? >> i think so. they're starting out with a half a percent and 1%, and they get a good high, and then as they continue to use that, it doesn't give them the same high anymore, so they seek either smoking more or higher potency materi...