I think it's a novelty. I seriously doubt it becomes a thing with middle class, educated Thais unless immersed in western culture, sensibilities. I've all the young people I've known I'd say a fraction will even try it later in adulthood. Not surprising, professionals usually not big weed smokers. If nothing else the absentmindedness
Novelty will wear off and weed shops in further dire straits. Only best and cheapest survive.