Tomacco is the produce made by Homer after (accidentally) mixing tobacco seeds and tomato seeds and then using plutonium rods to help the plants grow by putting it in the ground near the plants.
A tobacco company bought it, as it seemed to be legal, but Lisa did not approve because it killed consumers.
When Homer Simpson was selling it, all the animals ate it and became addicted to it. They became violent, and would do anything to get it. Everyone hates the taste of tomacco, but because of how addictive it is, they keep eating it.
When the plants started sprouting fruits, the family initially assumed they were just regular tomatoes until Bart bit into one (and later became addicted to them). On the outside, the fruits look like regular tomatoes but the inside of it is brown, flaky tobacco—this was what made the family realize that the tomato seeds must have somehow crossbred with the tobacco seeds.
Non-canon appearancesIn The Simpsons: Hit and Run, a billboard can be seen over a Tomacco field. It is also implied that Cletus Spuckler grew tomacco for the market in Level 1's bonus mission as well as Mission 4 where it was revealed that a crop circle emerged.
- In the new high definition opening sequence, Maggie is on the store conveyor belt alongside a bottle of Tomacco Juice.
- Ralph and Chief Wiggum claimed that tomacco "tastes like grandma."
- Inspired by Homer's accident, Rob Baur of Lake Oswego, Oregon attempted to create his own Tomacco Plant through grafting instead of radiation. The resulting plant survived while producing fruit for more than a year.