Not really sure on what makes them smell the worst.
I remember the worst I've ever smelled though. It was when I was a young kid, and I was visiting my dad. He ripped one and as soon as the smell hit me, streams of tears started pouring out of my eyes and vomit just started rolling out of my mouth like on the Exorcist.. I had to feel the walls to make it to the bathroom.. It is close to being one of the worst experiences of my life.
Cabbage and bacon is lethal. And if ya'll wanna do it big, next time you're in a car with your significant other, roll up the window, crank up the heat and let one go...