>Hence you will hear about people who have smoked a pack a day yet lived into their 90s without cancer At least for this, it's thought to be specifically linke

>Hence you will hear about people who have smoked a pack a day yet lived into their 90s without cancer At least for this, it's thought to be specifically linked to cyp p450 polymorphism. As the enzyme breaks down the carbon molecules from smoking, it creates free radicals which can cause cancer. People who express less of the enzyme experience a lower frequency of cancer from smoking, hypothetically.