"Several medical associations and civic networks also believe cannabis should be banned again before its recreational use gets out of hand. Estimates indicate that last year alone, up to 11 million Thais used cannabis for recreational purposes following decriminalization. This includes not just smoking pot, but adding it to beverages, foods, etc. The figure jumped by more than 900% from 2021."
This doesn't mean it is all one way or the other. You don't need to ban it, just make laws and enforce them, like you do with alcohol.