Are Electronic Cigarettes Poisonous to Dogs? Effect on dogs ECIGSSA Vape Forum South Africa 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 Your dog can't tell you they're breathing in secondhand smoke, but their lungs feel it. Protect your pets by keeping your home tobacco free. #QuitForThem #NationalDogDay