Study confirms most dogs exposed to e cigarette liquid have only mild signs Why e cigarette nicotine is dangerous for pets Petplan Comparative study of lung toxicity of E cigarette ingredients to investigate E cigarette or vaping product associated lung injury ScienceDirect Reggie's owner rushed him to the vets after he ate a bottle of e cigarette liquid. Sadly, the vet explains that nicotine is very toxic to dogs and can even be fatal. Channel 5 Facebook