I somewhat remember someone giving me a candy that looked and tasted like a sugar cube with a flower design on it in the mid 60’s. I think the brand was called Mind Candy. After one, the thought of having another did not occur, in fact very few thoughts at all occurred.
It did make music taste funny, gave my dog the ability to speak incessantly as well as turning him purple for about 12 hours. The product must have been a failure as I have not seen it since. It certainly was a strange candy though.