What is the leading cause of lung cancer?

The leading cause of lung cancer is definitely smoking. Quitting smoking can save you a lot of money in the long run too, not just on cigarettes but on potential medical bills for cancer treatment, which are extremely expensive. Other causes like pollution and radon exposure are also there, but smoking is number one. Prevention is always cheaper.

Hands down, smoking is the biggest reason for lung cancer. My uncle used to smoke a lot and he got it. Even passive smoking is dangerous. Then there's pollution and stuff, but mostly it's the cigarettes. Just don't smoke, simple.

Having personally battled with lung issues, I can tell you that smoking is the absolute worst. It was the cause for many of my friends' health problems, and sadly, some got cancer. Even if you don't smoke, pollution is a big factor, so try to protect yourself. It's a terrible disease, try your best to prevent it.

The overwhelming leading cause of lung cancer is tobacco smoking, both direct and passive. Other significant risk factors include exposure to radon gas, asbestos, and air pollution. If you're concerned about your risk, especially if you have a smoking history, it's important to talk to your doctor about screening options.