One of our vets encountered a concerning situation when her dog came across a discarded cigarette butt that had been thrown into their garden., Seeing the cigarette butt in her dog's mouth she quickly Can Sniffer Dogs Smell Weed Vape Pens? Vaping isn't just harmful to humans it's dangerous for our pets too! The aerosols from e cigarettes contain toxic chemicals and nicotine that can seriously harm pets if inhaled or ingested. Vaping isn't just harmful to humans it's dangerous for our pets too! The aerosols from e cigarettes contain toxic chemicals and nicotine that can seriously harm pets if inhaled or ingested.