2017 study: Bristol University researchers peer-reviewed study of 5,000 youths found that teens who regularly smoke pot are 26 TIMES more likely to begin using other drugs by age 21, and they're 37 TIMES more likely to be addicted to nicotine and 3 TIMES more likely to have an alcohol problem, all as compared to teens who don't smoke marijuana.
2017 study: The Journal of Neuroscience is identifying at the cellular neuron level how pot causes addiction and strongly interferes with the brain's sophisticated physiological reward system, which could be why Miley Cyrus and Woody Harrelson recently quit smoking dope.
2017 study: Colorado's Children's Hospital, in a post-legalization study, saw teens with marijuana intoxication or who tested positive for pot increase from 146 in 2005 to 639 in 2014. Unlike teens answering surveys, blood tests don't lie.
2017 study: Quest Diagnostics, mega workplace-testing lab, reports 2016 drug use up nationwide and single-year increases in the "legalization" states Washington, up 9 percent, and Colorado, up 11 percent.
2017 study: Highway Loss Data Institute reports that from 2012 to 2016 car crashes are up in decriminalization states. Oregon 4%; Washington 6%; Colorado 14%, as compared to neighboring states, including as THC-involved crashes soar.