They asked nicely - Lemmy.world

The actual rats want sugar. The human workers want cocaine.
The Rats Who Preferred Sugar Over Cocaine

If you have an overpowering sugar habit, I want you to know that this addictive feeling is not all in your head. You actually can get hooked.

HuffPost
Would not be so sure about the humans. I think more humans are addicted to sugar than to cocaine.
An excellent point! I stand corrected.