You are posting erroneously ☺️
Quite surprising for someone who actually lives in Thailand.
It is 100% legal to smoke weed in Thailand, as long as you don’t make a nuisance of yourself. Currently the ‘grey area’ is between ‘medicinal’ and ‘recreational’. Currently the ‘assumption’ is that everyone, unless proven otherwise, is utilising it sensibly for medicinal purpose.
Medicinal does not have to be something that a casual observer would notice. Do you know if your neighbour suffers from general anxiety or manic depression?
Furthermore, you, like many others who prefer to think you know it best, are confusing the plant with extracts from the plant.
The plant/flowers have no set limit to the amount of active component. It’s the extracts that are supposedly controlled. That way no one should be able slip a Micky Finn in your food and drink without your knowledge.
Though of course there are other reasons for the control of extracts.
So keep yourself up to date, smoking is completely legal right now. Some controls will likely be introduced over time, but sensible people won’t have any problems, as long as they are considerate of others.