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Keywords: Female, Light, Menthol, Ultra, Weight

A handful of in vivo animal studies have evaluated the chronic effects of e-cigarettes and shown minimal respiratory effects from PG and GLY aerosols without nicotine or flavor chemicals, although 90-day rat studies have demonstrated increased mucin production and nasal hemorrhaging from PG alone (75), while high concentrations of PG/VG altered pulmonary function in male rats (76)

And I might add, they all worked very well together

Smoking rates fell by 1% from 2014 to 2015

2018

It's a genuinely distinct category, worth knowing about if you're exploring alternatives beyond nicotine