Yes most cases of lung cancer can treated and cured if the lung cancer is caught early enough.
The longer you wait for treatment of the lung cancer the less treatable the lung cancer becomes.
So it's important to see a doctor often and get tested for preventable and treatable diseases such as lung cancer.
To prevent lung cancer avoid smoking, inhaling smoke, avoid inhaling second hand smoke etc.
Keep the air in your home healthy by using an air purifier etc.
But if you do still get lung cancer and you get diagnosed soon enough then the lung cancer in it's early stages is almost always treatable and curable.
So just because you do get some lung cancer doesn't mean you'll always die from it.
There have been many people who have been diagnosed with lung cancer that survived it so yes it's possible to survive lung cancer.
But once the lung cancer progresses too far then it's usually not curable.