lot of reasons ......vaping more often, throat irritation, head rush and many more
and you let me know how that glycerine works out for ya.....I think vegetable glycerine would be better. Also she may not want to deal with syringes, bottles mixing, storing running to the pharmacy, running to the health store, percentages(which is why I said read about mixing, so I didn't have to write all this and overwhelm someone