Fact: Continued smoking decreases the effectiveness of cancer treatment and may make side effects worse.

"As smoking decreases in the population, people who can't stop easily are becoming increasingly prominent."

Cigarette smoking decreases the level of this medication in your bloodstream.

Cigarette smoking may decrease blood levels of this medication.

The tobacco industry's main lobbying group, however, said smoking has not decreased in states that have anti-smoking laws.

Studies show that smoking makes symptoms worse in people with lupus and may decrease the effectiveness of some medicines.

Quitting smoking decreases your risk of heart and lung disease, as well as cancer.

Smoking can decrease the effectiveness of this drug (through liver enzyme induction).

Cigarette smoking decreases blood levels of this medication.

In addition, smoking decreases the blood supply and can bring germs and contaminants to the surgery area.