Why focus on secondhand smoke?
Secondhand smoke (SHS) is harmful to both people and animals. Pets breathe in the same toxins as humans and can also ingest smoke particles that settle on their fur when they groom themselves. This increases their risk of cancer, respiratory illness, and other health problems.
Protecting pets from smoke also helps protect children and adults in the home.
Facts in Los Angeles County
- In LA County, thousands of residents are exposed to secondhand smoke each year in homes, cars, and public places.
- Pets in smoking households have higher risks of lung disease, nasal cancer, and lymphoma.
- Indoor cats are especially vulnerable since smoke settles on surfaces where they walk and groom.
- Dogs living with smokers can develop cancers of the nose and sinuses (especially long-nosed breeds) or lungs (short-nosed breeds).
- Cigarette butts left on the ground are poisonous to pets if eaten.
What you can do to protect your family & pets
- Do not smoke indoors or in cars — even with windows open. Even smoking outside with your pet exposes them to secondhand smoke.
- Make your home and car 100% smoke-free.
- If you smoke, change clothes and wash your hands before interacting with pets or children.
- Talk to your doctor or call the California Smokers’ Helpline (1-800-NO-BUTTS) for free resources to help you quit.
What Public Health is doing
We work to raise awareness about the impact of secondhand smoke on pets and people.
We partner with community organizations to share educational resources and promote smoke-free homes and environments across LA County.
More resources
Last updated: September 2025