What if someone is so stoned that they can transmit their high through very close contact?

I think that's called a contact high.

Second hand smoke you mean? Lol

It's why it's great to get stoned with a friend and get a feedback loop going

That’s basically a running joke at my job about one of the bakers on the morning shift. Guy was a meth-head/dealer. Talks so fast and never shuts up that you’d start to wonder if you’re at risk of a contact high standing too close to him.

Oh, if only...

Oh like, mass (collective) hysteria

Sounds about right.

Yeah, like they breathe out gross alcohol vapor. They better go home or stay away from strangers.