Imagine that you are a genetic counselor, and a couple planning to start a family comes to you for information. charles was married once before, and he and his first wife had a child with cystic fibrosis. the brother of his current wife, elaine, died of cystic fibrosis. what is the probability that charles and elaine will have a baby with cystic fibrosis? (neither charles nor elaine has cystic fibrosis.)

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. 

This answer would be true