In November 1996, California became the first state to legalize medical cannabis. (Many) politics and (some) physicians promised us breakthroughs in better health. Thirty years later, how are we really doing? Men’s Health decided to find out in this special report package. Read more here .

A HIT OR two from a friend’s vape at a party, a low-dose gummy at a concert, a THC-infused drink at a comedy show—the average guy would be fine to drive home a few hours after doing any of this, right?

Michael Stevens, PhD, director of the Clinical Neuroscience & Development Laboratory at the Olin Neuropsychiatry Research Center , has spent roughly a decade trying to answer that question. When I asked Stevens how long he’d recommend a friend wait before getting into a car after taking THC, he joked, “How much do I like this particular hypothetical friend?” before settling on three to six hours.…