I'm not sure how you know what is questionable unless you have seen the facility where the juice is made and know what all the ingredients are. Just because a vender has a slick website and makes tasty, popular juice does that make him reputable? Without oversight I'm not sure we can really know. Am I wrong?
There was a tobacco vape, sometime last year, that had actual particles in it. I'm sure one of the Natural tobacco thread guys can remember the name. I don't believe that is sold anymore. If something is off, word of mouth is an amazing thing. Also, ECF vendors are pretty darn reputable.
I guess the way I would choose a vendor is to read the eliquid section of ECF, ask questions, or if someone you trust recommends a vendor that they have had personal experience with. All I can really say is read. Follow the vendor thread of one you are thinking about trying. Vendors don't get a following if their stuff is suspect in anyway.
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