I find that very hard to believe unless these people are making their own vape juice with hundreds of times the recommended amount of pure nicotine. For example, a standard Juul pod contains about 40 mg of nicotine, each puff gives you a max of 160 µg, which is significantly less than a 2000th of the commonly believed lethal dose (500 mg orally for a 80KG person).

https://pubmed.ncbi.nlm.nih.gov/33762429/

https://en.wikipedia.org/wiki/Nicotine_poisoning

Btw, there's in interesting story attached to mistaken view about what constitutes a lethal dose of nicotine.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3880486/