As national attitudes and laws around cannabis use have evolved, so have the commercially grown strains of the plant. Some marijuana varieties today contain levels of THC, the drug’s psychoactive compound, as high as 50 percent, compared to around 5…
By Miles O'Brien
Now legal in eight states, there are unanswered questions about the impact of recreational marijuana on public health. To maximize potency, pot can be purified for maximum THC, its psychoactive ingredient. But a lack of research and restrictions on these…
By PBS NewsHour
Business owners are replacing idealists in the pot-legalization movement as the nascent marijuana industry creates a broad base of new donors.
By Kristen Wyatt, Associated Press
Virtual reality is shedding light on the dangers of driving stoned.
By Catherine Woods
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