The evidence is quickly building.
Marijuana - which has skyrocketed in average potency over the past decades - is addictive and harmful to the human brain, especially when used by adolescents. In US states that have already legalised the drug, there has been an increase in drug-driving crashes, youth marijuana use, costs that far outweigh tax revenues from marijuana, a black market that continues to thrive, sustained marijuana arrest rates, and tobacco company investment in marijuana.
Drug supporters argue that marijuana legalisation will increase social justice. But the District of Columbia, Colorado and Washington DC have seen disproportionately high