The document discusses the health risks of smoking and the health benefits of quitting smoking. It states that principal diseases caused by smoking are cancer, COPD and CVD, and risks increase based on duration and amount smoked. On average, smokers lose 7.5 years of life. Quitting smoking leads to increased longevity and reduced risks of various diseases, with heart disease risk decreasing to non-smoker levels within 10 years. Within 72 hours of quitting, blood pressure and carbon monoxide levels return to normal. Long term benefits include halved lung cancer risk after 10 years and equal heart attack risk as non-smokers.