Vasectomy reversals show declining success rates over time, smoking worsens risks for polycythemia vera patients

A vasectomy can be reversed, but success rates decline over time. Men who attempt reversal within three years have a 75% chance of fathering a child, while those waiting 15 years see success drop to 30%. Smoking worsens conditions for individuals with polycythemia vera, a blood cancer caused by a genetic mutation. It increases red blood cell production and the risk of cardiovascular issues, including heart attacks and strokes. Quantifying the exact damage from smoking is difficult. Generally, smokers may lose 8-12 years of life, but for those with polycythemia vera, the risk is estimated to be at least three times higher.