Vaping Around Dogs Safe Ways to Vape If You Have a Dog Veterinarians warn that vape clouds in the home are just as harmful as regular smoke. Pets can develop allergies, coughing, and breathing difficulties, and citrus flavored e liquids are especially toxic, settling on fur, Why e cigarette nicotine is dangerous for pets Petplan Can thirdhand smoke hurt my pet? Thirdhand Smoke Resource Center 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.