According to information presented Monday at a meeting of the American Chemical Society, the modern marijuana effect is much stronger than the grass, which traded in the past generation.
Data were obtained from a laboratory certified to test the activity of marijuana in Colorado, where last year was legalized its use for recreational purposes. Dr. Andy LaFrate, who led the study, said that over the past 20-30 years, the concentration of the active substance has increased significantly. The average content of THC, the psychoactive component of marijuana, is now 20 percent. The researchers also came across the samples containing about 30 percent, and it very much.
The average concentration of THC in marijuana that police seized in the United States in 2012 was 15 percent. In the 80s, this figure stayed at only 4 percent.