A lab, really? The ratio calculators are well known and accurate. Vendors don't need chemists, because all of the flavorings and nicotine are not produced in house. They buy those elsewhere. The only vendors that might actually need a chemist would be Ahlusion and Aroma ejuice, and that would be stictly for the WTA side of things, and even then, not absolutely necessary.
But your missing a very important aspect. How do juice makers know that their ingredients are actually what they are supposed to be? A chemist would test all their ingredients when shipments arrive. They would test their nicotine base when they get a new shipment to make sure that the strength is what it's supposed to be. If a supply company sends a juice maker nic base that is 100x stronger than its supposed to be, and they didn't test it, they would be selling juice with dangerously high nicotine.
If they were supposed to receive PG, but their supplier messed up and sent them a barrel full of ethylene glycol and they didn't test it, they could be poisoning their customers. A professional setup checks the quality of their product from each base ingredient all the way to the finished product. Mixing a juice, and then vaping it to see if it's OK is not an appropriate method of quality control for a company who is supposed to be a professional juice maker.
Obviously these are some extreme examples, but they demonstrate a very valid point. Although I do agree with you 100%, I see no need whatsoever for juice to be manufactured in a clean room. That's something that is totally ridiculous, unimportant, and prohibitively expensive. It's a feel-good measure only.
One more thing I wanted to mention, is the whole fear people have of China juice. I prefer to buy US made juice for two reasons, and safety is not one of those reasons. The first reason is that if something IS wrong with the juice, its quite easy to "go after"" the manufacturer that's selling the dangerous product if they are here in the US. Try going after a Chinese juice manufacturer if they poison you.
The second reason is purely economic, that I prefer to support a US based business over a foreign, simply to keep the money in the (somewhat) local economy. If I could find a juice maker in my city or state I'd prefer to buy from them for this same reason, to keep wealth within my local economy instead of sending it to a far off location.
But I truly believe that Chinese juice such as Dekang and Hangsen is likely overall safer than your average US juice is.
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