Is It Dangerous To Vape Around Pets? Cronulla Vet Clinic Vaping Around Dogs Safe Ways to Vape If You Have a Dog Little Bear would like you to know the DANGERS OF VAPING AROUND YOUR PETS! Experts have warned the vapor could cause health problems like heart disease, respiratory issues and even cancer. A Secondhand smoke and secondhand aerosol 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.