Cigarette Smoking
The leading cause; contains carcinogens that damage lung cells.
Exposure to
Radon Gas
A naturally occurring radioactive gas that can accumulate indoors.
Passive Smoking (Secondhand Smoke)
Inhaling smoke from others increases risk significantly.
Air Pollution
Long-term exposure to polluted air, especially particulate matter.
Genetic Factors
Family history can increase susceptibility.
Marijuana Smoking
Contains tar and carcinogens; heavy use can increase risk.
Age Factor
Risk increases significantly after age 65.
Poor Nutrition and Lifestyle Habits
Low fruit/vegetable intake contributes to lower lung defense mechanisms.
Metal Fumes From Welding
Welders are at higher risk due to chromium and nickel particles.
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