Hasn't this been a problem around longer than legalized rec?
I always figured these plants picked up the vibrations of whomever was growing them.
Only way around it is to make friends with a kind grower or grow your own.
One of my older buddies who was a really experienced grower told me about the "Secret Life of Plants" and his experiments into growing using music, love, meditation etc. Said it worked, the more quality time he spent with his crop all affected the end product.
A mate of mine reckons he can tell city greed weed from well grown herb just by the vibe.