Please explain that to my paternal Grandfather. He's dead. Died from lung cancer brought-on by smoking tobacco (onset was 5 years after he'd quit in 1972). Ripe old age of 55, he was. Family history of cancer? Nope. Did he commit suicide, or was he poisoned? You make the call...
Philip Morris execs publicly insisting that there were no health hazards involved in smoking tobacco up until the late '70's. (As of 1961, they already had strong scientific evidence that tar was a carcinogen). Tobacco was even readily available to children in retail outlets at that point in time.
No different than if they'd served him a strychnine-tainted cocktail, and assured him it was safe. It wasn't 100% sure to kill him, but it did.
Not all smokers die from smoking and most assuredly, not all smokers get lung cancer.
Belated condolences on the death of your grandfather, but please don't use his death, for refutation.
The Surgeon General Report on smoking came out in 1964.
If you deliberately shirked personal responsibilty by not voting to recall a product quitting smoking once you became aware that it was fatal and failed to bring it up to board members, then you'd be complicit at the least.