What exactly is USP? I havent researched the DIY aspect too much. All i know is theres 4 ingredients (PG, VG, Nicotine, Flavoring).
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USP will be found in any juice you buy. USP stands for U.S. Pharmacopeia (Pharmaceuticals) Unflavored, No-Nic VG or PG. 100% VG has USP VG and VG-based Nic, and 100% PG has USP PG and PG-based Nic. 50/50 is 50% PG and 50% VG, with the Nic coming from one source or the other.
When you buy your Nic-base, it will be in either PG or VG.
Nic-base is sold in 24mg, 36mg, 48mg (I think) up to 100mg.
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Just call me 






We got the heavy slushy stuff yesterday, and we'll get more tomorrow. This is the New York January we are all familiar with, so it is not unheard of. The sidewalks were a mess in the city, and I hope that those got cleared off sometime after the last time I was out in it...