Most of the risk of poisoning for animals is from ingesting the e-liquid itself, which contains high levels of nicotine. The issue is that the amount of nicotine in each cartridge contains the equivalent of one to two traditional cigarettes.
The sweet aroma of the liquid nicotine contained in e-cigarettes can be alluring to dogs, and the non-tobacco flavoured e-cigarettes can be particularly enticing. If packets of refill cartridges are left lying around the house and your pet chews them, they might end up consuming a very large amount of nicotine (especially as these packets usually contain five refill cartridges).
As well as the toxicity of nicotine, the actual e-cigarette casing could cause an injury to your pet’s mouth when chewed. It could also cause gastrointestinal upset, with the risk of obstructing the intestine.
Some e-cigarette users buy vials of liquid nicotine solution for refilling e-cigarette cartridges. The small bottles hold enough liquid to fill multiple cartridges, meaning they contain a considerable amount of nicotine.