There will be free cannabis samples and experts to answer pot-related questions — but no munchies — at London's first cannabis consumption event this weekend. Lux Smoke Cannabis at 467 Wharncliffe Rd. S. is holding the event Saturday from noon to 4 p.m. in a nearby parking lot, where nine licensed pot producers will set up booths. The event is the brainchild of Lux owner Marga Vertolli, who has been exploring the concept for the…