David Kretzmann just got back from a cannabis business conference in Toronto. As Canada gets ready to legalize cannabis use across the country, we discuss the ripple effects for businesses and the opportunities for investors.  And just what do exhibitors on the trade show floor give away to attract attention at their booths?  To stay up to date with the latest coverage of this industry just visit www.fool.ca/marijuanamoment. Thanks to Casper for supporting The Motley Fool. Save $50 on a mattress at http://www.casper.com/fool (use the promo code “Fool”)