For decades, people have invented various drugs to poison mice, but people have found that the method of placing rat poison in places where mice often go in and out is becoming more and more ineffective  No matter how delicious food people add drugs to mice, mice will ignore the delicious sent by them  According to this phenomenon, the possible explanation is that mice have a very sensitive sense of smell
They can identify substances harmful to them from any complex smell
Put any food in the place where the medicine was put before, and the mice won't eat it.