The following is about human health.

A, according to the analysis, taking drugs will damage the human nervous system and respiratory system. Once it is polluted, it is difficult to quit, which will seriously harm the physical and mental health of the human body, harm the society and make people suffer from poison. A is correct;

B gonorrhea is a sexually transmitted disease caused by gonococcus, and its pathogen is gonococcus. Gonorrhea patients belong to the source of infection, B is wrong;

C smog can enter human body through respiratory tract, and bronchi and alveoli can't effectively remove tiny particles in smog, which is harmful to human health. C is correct;

D. The tiny particles in smog can make people suffer from respiratory and cardiovascular diseases. D is correct.

Therefore, choose: B.