Scientists have found that capsaicin, the main component of cayenne, may literally stop a heart attack in its tracks when applied topically. http://www.naturalnews.com/027238_capsaicin_heart_attack_cayenne.html
Tip from Tom: So, if you are ever where someone is having a heart attack and you just happen to have left your bottle of cayenne pepper at home, grab some at an Indian restaurant or supermarket if they are handy.
I carry a little sandwich bag with some in it.