Isn't PEG-400 what they used to use in most vape juice liquids? Did they quit using it? I've read up on it but haven't tried it, was curious why (if it is true) it's not being used anymore. I've been dabbling with this project myself, been using straight vegetable glycerin and it's been kind of hit or miss, sometimes it mixes up just beautifully, and other times it just WILL NOT mix up together at all. I bought food grade propylene glycol, which I'm sure you've seen many forums suggest mixing 50/50 (the PG acts as an emulsifier,) but PG is also harsh on the lungs and noticeable in a mix.
I tried the o.pen juice originally, definitely worked well. I've had the cartridges from dispensaries, I'm not sure what they use with those CO2 extractions but it's WAY harsh on the lungs versus what I've made at home.
I've done many batches of this and went from reaaaaally DARK to a perfect amber lol!
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