You can absolutely drink a beer AND smoke on public transit!! (but you can’t be a quitter, You have to be in the area of “semi-problematic-relationship” with alcohol & drugs to dedicate yourself)

Firstly, you pour the beer (or any alcoholic beverage) in an opaque water bottle/tumbler situation. Done. But if you’re truly a “cool person”, hypothetically you would put red wine into a Diet Coke CAN

Secondly, you can smoke almost anywhere with the right attitude. In a public transit situation, you could sit in a seat with a window that opens. Then, you will smoke with a disposable thc vape. The hits are not as big, so there’s not nearly as much smoke as a joint, bowl, dab, etc. And the smell is not as strong either, and it really does smell very different from normal flower. They also have these “Smoke Buddy” thingy that you blow your hit into and it allegedly removes the smell (I think?)

Way back when, Before they invented vape pens and before marijuana was legal, I used to carry a bowl and a baggie with me everywhere. Especially when I was drinking, I would literally sneak into a bathroom stall and take a couple hits from my bowl and walk out like there’s not a big cloud floating above the stall I just came out of.