I guess this is a good place to ask my question. I got a vaporizer and have been using it for two weeks with much success. The last time I tried to quit (6 months ago) I used an e-cigarette which caused me to have a ton of gunk in my throat, which I could not clear. When I bought my vaporizer the seller talked to me about the difference between vegetable glycerin and propylene glycol; stating that the e-cigarette I was using was all PG. The "juice" I have been using from the store is a mixture of the two but my friend makes his own "juice" and uses solely PG. My question is: am I going to have the same throat gunk if I use his all PG juice? (I have not had the problem with the PG/VG mixture.) The juice he makes himself is significantly cheaper but I don't want the gunk in my throat; I'm trying to get all that junk out. Thanks in advance for any help or suggestions.