This is an interesting article about 2nd hand smoke and pets:
Pets are at greater risk from passive smoking than humans because they spend more time in the home and closer to carpets where carcinogenic particles can linger.
New research shows that animals exposed to second-hand smoke go on to develop a host of health problems including cancer, cell damage and weight gain.
Scientists at the University of Glasgow have established a direct link between family pets living in a smoking environment.
The study found cats are particularly at risk from second-hand smoke, potentially due to…(to read the full article, go to: http://www.telegraph.co.uk/news/health/pets-health/12073331/Second-hand-smoke-linked-to-pet-illnesses.html