My mom was a smoker but quit 25 years ago. She was diagnosed at age 58.
My dad was a smoker but quit about 30 years ago. He was diagnosed at age 65.
And I know of countless people who smoke and they have no problems. My belief it is all a "lottery".
My mom's tumor was an aggressive NSCLC adenocarcinoma; my dad's was a less aggressive BAC. The two don't seem to be related.
Like Snowflake said, my parents contribute their survival so far to pure luck. Of course a good medical team helps. But otherwise it was luck of the draw. My mom was overweight and diabetic at diagnosis, otherwise healthy. My dad was a little chubby, otherwise healthy.
People ask my mom all the time: lung cancer, chemo, radiation, lobectomy, pulmonary embolism, brain anyerusm, triple bypass all within 3 years. "HOW DID YOU SURVIE AND HOW DO YOU LOOK SO GOOD NOW???" they ask. Her response "LUCK!".