It isn't caused by smoke, rather by feline leukemia. I know, I lost one to lymphoma.
BTW, the average age isn't ten either, according to my vet it is around 6.
It's just more inaccurate, deceitful and dishonest information to lean on the smokers. Anything they can put into print to make us look bad. That's what they are all about.
I'm fed up with this stuff. They are just turning us into mean and hateful people who are tired of being picked on.