Firefighters are known for their bravery. Their job description includes risking their own safety for the sake of others. But it turns out that forging into raging fires isn't the only danger firefighters face. Frequent exposure to smoke and chemical fumes puts them at higher risk of certain diseases, including bladder cancer.

A research team tested over 1,000 active and retired firefighters. Ninety-nine of the firefighters exhibited warning signs of bladder cancer, and two were diagnosed with the disease. The overall incidence rate of bladder cancer for firefighters was 36 of 100,000 -- which is higher than the general population.

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