Weed is the new bitcoin. While the world of marijuana-related companies trading on U.S. stock exchanges is not large, one of the premiere examples had a roller coaster ride last week. Tilray, a Canadian-based medical marijuana company, first started publicly trading in the U.S. in mid-July. It bounced around $25 a share through mid-August, then shot up to a peak of $263 on Wednesday — roughly a ten-fold increase in about a month.