Fumes are good and good for ya....
We have a joke going around the shop... a guy goes out to his garage and gets into his ultra low emissions vehicle and starts it up with the garage door closed in an attempt to commit suicide. Five hours late he is still alive and his wife comes out and yells at him "You can't even do that right,, you loser".
Did you see the episode of "Earl" where the guy ran a hose from his tail pipe into his car (a Yugo) to try and kill himself but always failed because the car would only run for about 30 seconds... Earl kept siphoning his gas...before each attempt...