I wonder if the paranoia people get is more aligned with the fact that it's illegal (and a perceived stigma against it), and you are now participating in something illegal, than an actual psychological effect of the drug.
"Oh they can tell!"
"Oh man, there's cops there, can they smell it? Are we going to be arrested?"
I don't honestly know. Because if it was a chemical reaction causing paranoia, wouldn't it do that for everyone? But if this is the case, maybe it wouldn't be such a prevalent symptom if it was legal.
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