Of course, being courteous is a must, but then there are "marijuana Karens" in the world who smell things no other neighbors can smell, and use complaints maliciously. Possession is a different issue from smoking in a building. Trying to ban possession was a Karen thing to do...and it didn't make it past the courts.
The legal question is not as dumb as some seem to think. The primary legal instrument for this is the Public Health Act B.E. 2535 (1992), particularly its provisions related to public nuisance. In 2022, the Ministry of Health issued a notification that clarifies that causing smoke or odor from cannabis, hemp, or other types of plants which may deteriorate or harm the health of bystanders or any person who suffers from such an action, is considered a public nuisance under the Public Health Act. It goes on to define a nuisance, including frequency, a mechanical measurement of smell strength, and most importantly a true demonstrable impact on the health of others.
Then, based on that law local police department set some standards as to what they believe constitutes an actionable nuisance. If the police won't get involved, there's a way to ask for an investigation by the health department. So, my question was about the publication of police standards for the enforcement of this law. I don't think that's been dealt with at a national level yet.
Karens sniffing at her neighbor's doors and declaring a health emergency does not meet the legal definition of a nuisance. There will eventually be a legal balance found between patients' rights to consume and those truly affected by a nuisance to protect their health.