A Buddhist monk fishes out a vial of cannabis oil from his robe and puts a drop under his tongue –one of many people flocking to a weed festival in north-eastern Thailand, where excitement is building over a medical marijuana boom.Thailand became the first country in Southeast Asia to legalise marijuana for medical purposes last year, joining a growing list of governments including Canada, Australia, Israel and more than half the states in the United States (US).The global market is forecast