Entrepreneurs will gather in Las Vegas today for the third annual Marijuana Business Conference and Expo, the latest reminder of pot’s rapid conversion from a criminal enterprise to an ordinary industry. Seminars will cover everything a would-be drug lord needs to know, from horticulture to financing. Ben Cohen, one of Ben & Jerry’s founders, is among the speakers. The conference will be the first chance for the pot industry to inhale the results of last week’s ballot initiatives in Alaska and Oregon, the latest states to vote to legalise recreational marijuana (Colorado and Washington have already done so; a further 19 states allow medical cannabis). Aspiring tycoons are already looking ahead to the next big round of ballot initiatives, due in 2016, when California is expected to vote “yes” to recreational weed. Some see that as the point of no return for legalisation in America.