walking by someone smoking it makes me “high”

No it doesn't.

Today, on this episode of "making my paranoias everybody else's problem"...

Even at home?

Ah, a terrible take on prohibition. Have an upvote.

I agree but not because of your personal problems. Inhaling smoke it very stupid for anyone. THC itself is a wonderful drug.

in some of the other comments OP, you say you used to smoke.

one of the potential effects of cannabis is paranoia. This sounds like that. Talk to a professional, and get some help. Like honestly, this is concerning.

Drugs, gambling, liquor stores, prostitution, and any other vice type should be limited to businesses for the express purpose or individuals on their private property, But not in public places or businesses that are not specifically for the vice. In addition advertisement for these type of adult vices should be limited to other adult vice businesses. In other words you can hang up bar adverts at the casino and dispensiaries and such. No regular business can have the activities on its premises, it is limited to private residences and associate private property (if allowed by owner) outside of businesses. So rentals could allow it in units but could not in any of the common areas.

Just look at the result of the alcohol ban in the US.

I don't like tobacco but I understand that people can smoke when nobody around has a problem with that.

I'd say "ban cannabis" is not exactly an unpopular opinion, the majority of the world governments have it banned, but smoking specifically does make it weird

How do you feel about people smoking tobacco in public spaces? What are your thoughts on designated smoking areas?

Smoking next to kids at public spaces should be banned, the same should for Cannabis imho.

Let's take it one step further: smoking should be forbidden everywhere. What do you think?