Which of the following is not a recommended change in physical activity for aging individuals? a. taking a longer time to warm up and cool down b. being cautious about exercising in extreme conditions c. using less weight, but adding repetitions d. participating only in cardiovascular exercises  

D. Participating only in cardiovascular exercises. Changing to only cardiovascular exercises would not help an aging individual. 

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.