Are Electronic Cigarettes Poisonous to Dogs? Exposure to cigarette smoke found to increase cancer risk in dogs Is Vaping & E Cigs Poisonous To Pets? The Dangers with EJuice Is It Dangerous To Vape Around Pets? Cronulla Vet Clinic 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.