Health officials often talk about the dangers of living with a smoker, but few pet parents are aware that our animal companions face similar risks—from respiratory problems to cancer—when exposed to secondhand smoke. New research suggests that secondhand smoke is unsafe at all levels—for humans and pets—so it's time to get serious about ditching those butts for good.

One recent study shows that nearly 30 percent of pets live with at least one smoker. This is a grave concern, according to Dr. Sharon Gwaltney-Brant, Medical Director of the ASPCA's Animal Poison Control Center, since secondhand smoke can damage the nervous systems of both cats and dogs.

"Tobacco smoke has been shown to contain numerous cancer-causing compounds, making it hazardous for animals as well as humans," says Dr. Gwaltney-Brant. "Exposure to secondhand smoke can cause many of the same harmful inflammatory changes in the airways and lungs of dogs as their human counterparts."

Cats who live with smokers are prone to developing malignant lymphoma, perhaps as a result of ingesting carcinogenic residue when it settles on their fur. Kitty's canine counterparts are especially vulnerable to secondhand smoke's respiratory effects, and can develop life-threatening nasal and lung cancers.

Nicotine—found in cigarettes and other tobacco products—is also highly toxic to animals if ingested. A dog who accidentally eats tobacco may develop weakness, muscle twitching, decreased breathing rate, and finally collapse, coma and possibly death. The ASPCA strongly recommends keeping your pet away from tobacco as well as secondhand smoke.

In honor of Prevention of Cruelty to Animals Month this April, why not resolve to avoid smoking around your pet? Smoke outside and preserve the lungs of your two- and four-legged family members. Or better yet, toss those cigarettes in the trash—your pet will thank you! For more information about protecting the health of your furry friend, please visit the ASPCA’s Guide to Pet Care.