Have you ever noticed how your cat or dog avoids you when you are smoking a tobacco cigarette? This is because they have an enhanced sense of smell for one thing and the smoke stinks really bad to them. Another reason is that is chokes them just like it does other people you might be around. Some cats and dogs are even allergic to tobacco smoke and it can really make them sick. Using an electronic cigarette near your pet is not likely to bother them at all because the vapor from it dissipates almost instantly. No smoke lingers in the air of your home because there is no real smoke. Your pet might become your best friend again if you use an e cigarette instead of smoking tobacco.