Norman Edelman Risk Quotations

The risk does decline with time after you stop but those numbers aren't clear,

We're gambling with other things in the environment or genes or both, ... The fact that Jennings smoked for a long period of time increased his risk of getting lung cancer. How much that risk was dissipated by stopping for 20 years I don't know, but it was obviously not entirely.

Quitting is good. It's always good to quit, no matter how long you've smoked, ... You'll reduce your risk of lung cancer, reduce the degree to which you have chronic obstructive pulmonary disease, reduce your risk of other types of cancer and of heart disease. The data is very clear. Even if you're 75, you can benefit from stopping.