I believe poppers are chemicals like butyl nitrate. Nitrates are supposed to be carcinogenic. You may be mixing up your pork and your poppers. The chemicals in poppers are used in the medical world to relieve pain for people who have coronary artery disease.
Amyl nitrite dilates blood vessels, easing the heart's work.
Recreational users of poppers like the feel of blood rushing to the head, a flush of heat, dramatically altered consciousness, and heightened sensual awareness. There are potential dangers with using poppers, but they're not the same as the ones associated with foods containing nitrites, like bacon or hot dogs. Vitamin C helps block this conversion. Nitrates, also added to cured meats, convert to nitrites in the body. All nitrites are poisonous in excess.