Bladder cancer and cigarette smoking in males: a case-control study.

Cigarette consumption was compared between 355 males with cancer of the lower urinary tract and 276 male hospital controls. Both duration of smoking and average daily consumption of cigarettes showed a dose-response relationship with risks of developing bladder cancer. Quitting smoking seems to have a protective role, whereas higher relative risks are associated with an early age at start of smoking. The use of a filter seems to have a weak protective effect.