Are people really "smoking meth" on SF Muni buses or trains? I doubt it. On a bus/train, the driver would stop and call the police.

    > uncomfortably hot temperatures

I have been in an SF muni car with someone actively smoking something that was not marijuana or a cigarette. I think it was fentanyl but I’m not sure. This was about two years ago. I hope this is tolerated less now than it has been.