Are poppers (amyle nitrate) bad for health? I have prostate cancer (seeds implanted for ext beam radiation) and started poppers once a week.

Why. Are you doing that? If for the very brief high experience its a very bad idea for you. At 82 years old the significant blood flow and heart rate increase could put you at risk for a heart attack or stoke. In appropriate ingestion can cause serious medical conditions and even death. Talk to your doctor about it. There are other options to boost energy.