stay away from smokers

From the BBC

Dr Twalib Ngoma, president of the African Organisation for Research and Training in Cancer (AORTIC), says that Africa is on the brink of a smoking epidemic.

Epidemic?

"For the first time in history, we have the tools in hand to prevent a pandemic," says Dr Otis W Brawley, chief medical officer of the American Cancer Society.

Pandemic?

As far as I'm aware smoking is not contagious.