Well, I don't know if there is such a critter, but if you can find a brand of cigar without all the standard chemical additives, it might help a little. I know you can find cigarettes like that - American Spirit is one manufacturer.
Otherwise, just a healthy life style - you know the standard - lots of leafy greens, light on the red meat and pork and cheese, get more protein from grains. Eat organic if you can. Since you are already assaulting your system with chemicals, try to keep them out in other ways as much as possible.
I guess I'm a bit of a fatalist. I figure it comes down to the DNA your folks gave you as much as anything else. When you're number is called you go. Meanwhile, enjoy your life.
