Pot stocks may have cooled off in recent months but the industry is still hot and Bank of America Merrill Lynch expects it to get hotter as it reaches maturity. "We expect all companies to deliver attractive growth over the next few years, reflecting a low base and strong demand in a newly created legal cannabis markets, namely Canada," Bank of America Merrill Lynch analyst Christopher Carey wrote in a note. Part of the reason for the industry's cool down in recent months is that the short-term growth story for many companies has gone up in smoke.