During his first night in the detoxification unit, quent developed what seemed like a case of the flu. he ached all over and had diarrhea. he was probably withdrawing from: heroin. alcohol. cocaine. cannabis.

He was probably withdrawing from heroin. Heroin overdosed, it occurs when one has been without for some time and then takes one’s usual dose. An intravenous heroin user feels intense cravings when he sees hypodermic needles as an example of classical conditioning.

answer; i believe the answer is (polygenic inheritance;