The Moxa stick

Met up with my friends for a early morning coffee before work the group grew as we sat in the coffee shop window and as people passed by they saw us and joined in - one was an acupuncturist who ended up giving me the stick of Moxa which to me seemed like one giant weed - I was advised to set it on light and waft the heat close to my knee - the smoke generated was probably the therapeutic part of the treatment - unbelievably this is all legal - I ended up smoking out Marks bathroom and nearly set my trousers on fire