What about the responsibility of the person that was smoking after being warned it could pose health hazards?
I despise PM as a company, however PM did not force this person to use their product.
One question. Is nicotine addictive?
If the answer is "yes", then PM did quite a lot to force this person to use their product.
If the answer is "no", then your position makes sense.
Unfortunately for you, the answer is most assuredly "yes".