More cheap weed may lead to higher rates of mental health problems New York City has ranked as the world’s cannabis capital, where denizens blaze through 62.3 tonnes of pot each year, significantly more than runners-up Sydney and Los Angeles. The scorecard from CFAH, a wellness group, placed five other US cities in the top 20 — Chicago, Houston, Phoenix, Philadelphia, and Denver — each consuming at least 6.8 tonnes of weed each year. Europe and North America dominate the table. The only other country that comes close to the US is Canada, with four cities — Toronto, Vancouver, Montreal,...