"Many coffee shops now are selling the stuff... and smoking it."
Real coffee shops continue to sell only coffee and sometimes tea as well. This concept of a coffee shop selling cannabis is from Holland, it's like an euphemism, when someone says coffee shop there, everyone links it to cannabis. Here in Thailand it's just some cannabis entrepreneurs who copied the concept, the person buys some cannabis and consumes it on the premises, no need to take it home. Because of the lack of regulation some places like this have the chairs and ash tray outdoors, in front of the shop! This cannot happen in the Netherlands