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Are Electronic Cigarettes Poisonous to Dogs?

Posted April 09, 2014 in Dog Toxins & Poisons


Recently, a puppy died after ingesting part of an electronic cigarette. While the story went viral on social media, the question that remains is just how poisonous are electronic cigarettes?

First, as a non-smoker, I love electronic cigarettes as there’s no second-hand smoke exposure to innocent bystanders (e.g., family members, dogs, and cats). That said, they still pose potential health risks to the smoker and to any pet that accidentally ingested them. Here, you can find more information about electronic cigarettes from the FDA.

What are electronic cigarettes?
Electronic cigarettes are battery-operated products that use a cartridge that contains a diluent (typically propylene glycol). The same diluent is found in “pet-safe” antifreeze and glycerin and also found in nicotine and flavoring agents. [Editor’s Note: Pet safe antifreeze is safer than other kinds, but it’s still poisonous. Seek medical care immediately if your pet has ingested antifreeze of any kind.]

Electronic cigarettes basically work by converting the nicotine solution into a vapor instead of a smoke so that the vapor can be inhaled by the user.

What are the dangers of electronic cigarettes for my dog?
The problem is that these cartridges can contain different amounts of nicotine ranging from 16 to 24 mg per cartridge. That said, electronic cigarettes are just as poisonous as regular cigarettes or cigars. The threat varies depending on how much nicotine is ingested.

How much nicotine is in various products? Table excerpted from Osweiler--Blackwell's Five-Minute Veterinary Consult Clinical Companion: Small Animal Toxicology

Nicotine-containing product

Average amount of nicotine (mg/g)

Average amount of nicotine per typical size or “unit”

Unfiltered cigarettes


12 mg per cigarette

Filtered cigarettes


11.8 mg per cigarette



100-444 mg per cigar

Chewing tobacco



Nicotine patches


7-114 mg per patch

Nicotine gum


2-4 mg per piece

When it comes to poisoning, there are two potential concerns with electronic cigarettes: the amount of nicotine and the battery (which can cause corrosive injury depending on the type of battery).

Symptoms of nicotine poisoning in dogs
Depending on how much nicotine is ingested, severe poisoning can be seen in dogs. Clinical signs of nicotine poisoning can be seen within several minutes; they can last for 1-2 hours (in mild cases) or 18-24 hours (in severe cases).

Clinical signs seen with nicotine poisoning include:

  • Drooling
  • Vomiting
  • Diarrhea
  • Nervousness
  • Agitation
  • Weakness
  • Dilated pupils
  • Walking drunk
  • An abnormal heart rate

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Justine has more than 18 years of experience in the veterinary industry and is a board-certified emergency critical care veterinary specialist and toxicologist as well as the CEO and founder of Vetgirl. She is also a founding member of IDEXX’s Pet Health Network team.