That's absolutely not the same situation and is irrelevant here.

Homeless people injecting heroin in bank vestibules, bleeding on the street, or smoking crack on sidewalks != middle class people smoking cannabis at home.

But Thailand is an extremely conservative country, and this decision is ultimately rooted in a moral judgement, not based on impact to the rest of society:

> “We drafted this law to prohibit the wrong usage of cannabis,” said the health minister Cholnan Srikaew, reported Reuters.

> “All recreational usage is wrong.”

https://www.cnn.com/2024/01/10/asia/thailand-cannabis-revers...