Is it rude to feed someone "weed laced" brownies without their consent in your opinion?

Basically awhile ago, my cousin told me an instance where he fed his friends a bit (obviously not an insane dosage, but still) of "weed brownies" without their knowing. They aren't weed smokers at all, so it's not like your every day prank. Even though weed is harmless, would you consider this rude, in a way? Or basically a harmless joke since weed itself doesn't necessarily cause any harm?

I have my own opinion, but just curious to see what others might think (and if you're curious what I think, I think it's a tiny bit fucked up, considering they may or may not have had their own moral beliefs towards the plant, but worse things can definitely be done).