North Carolinians for a Tobacco Free Generation Happy National Pet Day They trust you with everything, including the air they breathe. Secondhand smoke and vape aerosol can harm Instagram Is Secondhand Weed Smoke Bad for Dogs & Cats? EarthMed Everyone knows that secondhand smoke is harmful to humans, but did you know it can be equally detrimental to your pets? The severe dangers of smoking around your dog First Aid for Pets Vaping isn't just harmful to humans it's dangerous for our pets too! The aerosols from e cigarettes contain toxic chemicals and nicotine that can seriously harm pets if inhaled or ingested.