Honestly, it depends on your body. Everyone has cancer cells in them - they are just mutated cells. If your immune system is good and healthy, your body will get rid of them. If it's not for some reason - if you smoke, or eat badly, or don't exercise, or just have a low immune system, they will build up in one place and accumulate and then you will develop tumors.
Some people never have cancer and smoke 40 years. Some people never smoke, and get cancer of the lungs - or throat, etc.
It all depends on your body.
