Should states regulate marijuana by its potency? Some say yes

NEW YORK (AP) — As marijuana legalization spreads across U.S. states, so does a debate over whether to set pot policy by potency.Under a law signed last month, New York will tax recreational marijuana based on its amount of THC, the main intoxicating chemical in cannabis. Illinois imposed a potency-related tax when recreational pot sales began last year. Vermont is limiting THC content when its legal market opens as soon as next year, and limits or taxes have been