Question

never Mortality due to lung cancer was followed in groups of males in stopped the United Kingdom for 50 years. Figure 2 shows the cumulative risk of dying from lung cancer as a function of age and smoking habits for four groups of males: those who never smoked, those who stopped at age 30, those who stopped at age 50, and those stopped who continued to smoke. These data show clearly that an age 50 individual can substantially reduce their cumulative risk of dying stopped from lung cancer by stopping smoking. What do you suppose is age 30 so never the biological basis for this observation? smoked 4555657585 Figure 2. Cumulative risk of lung cancer mortality for nonsmokers, smokers, and former age (years) smokers. Cumulative risk is the running total of deaths, as a percentage, for each group. Thus, for continuing smokers, 1% died of lung cancer between ages 45 and 55, an additional 4% died between 55 and 65 (giving a cumulative risk of 5%); and 11% more died between 65 and 75 (for a cumulative risk of 16%). lung cancer mortality, cumulative risk %)

Answer 1

Soln- This observation is based on the smoking pattern of a group of individuals accoding to their age. This data shows tabt if an individual stops smoking then one can reduce the risk of developing of lung cancer. Tobacco consists of toxic chemicals that when inhaled makes our blood toxic. This blood is carried all throughout our body parts that leads to slow damage of our organ system. Slowly but surely our immune systems weakens. The toxic chemicals of tobacco damages the lining of the lungs and makes permanent damage that reduces the ability of the lungs to exchange air efficiently leading to breathing disorders. These chemicals damages the DNA that causes cancer. It disrupts the DNA functioning and also lessen the benefits of chemotherapatics. So here definitely those who stopped smoking reduced their risk of cancer.