You may want to stop smoking if you care about your immune system — here’s why?

An ashtray filled with cigarette butts is seen on an outdoor smoking stand at a bus stop. — AFP/File

Smoking is so bad for the body that it alters a person’s immune system, making them more susceptible to illness and infection even years after they have stopped, as per a recent study.

Smoking continues to be the greatest preventable cause of death in the United States, accounting for…