USA – A massive Las Vegas cannabis convention has been cancelled by its venue due to security concerns. Billed as “the largest head shop on the planet,” Cannapalooza was expected to bring over 50,000 visitors and cover 4,645sqm. It was due to run from 19 to 21 March this year at Mandalay Bay hotel. Cannabis possession is illegal in Nevada. Organiser Lou Woznicki says he walked in to a meeting on 27 January only to be confronted by more than 100...