One thing I do not understand is if one realises if a vendor is using ingredients such as PG/VG,flavorings and,food colors that are certified as GRAS (Generally Recognized As Safe) and,pharmaceutical grade nicotine base actual improvement in the quality of the ingredients is a moot point. These ingredients
are already made to strict and uniform standards by regulation. I understand subjective concerns such
as wanting kosher,organic or natural ingredients but, objectively they do not confer any real measurable
real world increase in "quality".
My local B&M will mix juice right at the counter. They have premixed bases and its just a mater of
filling the right amounts in the size bottle one wants to purchase. Unless your going below 10mm bottles it is not difficult to obtain an accuracy that is sufficient to maintain a consistency in product. They use bottles that are basically the same as one would find condiments such as mustard and ketchup with the tapered nozzles. These bottles appear clean and well kept to me. Nothing touches the ingredient but the air between the nozzle and receptacle. Considering that PG and or VG both have robust antibacterial and antiviral characteristics and the rest of the ingredients have to real nutritional
value or are known toxins such as the nicotine there is really no reason to fear that any actual
pathological contamination is occurring or even if it's possible to occur unless done deliberately.
The counter is neat,clean and,well organized. The counter person is not sneezing,attending a runny
nose nor scratching inappropriate places.
If anyone knows of any pathogen ever having being spread by e-juice let me know. As of today
I have never heard of a single case of such a thing happening no mater where the juice was made
and how bad one could imagine the hygiene of the person who made it was.
Having researched the what the ingredients in e-juice are and how they are made it's my humble
opinion the ingredients and the process used to make the final product add a robustness to safety
hard to find in most processes used to manufacture products in general. A neat,clean and organized
work area using clean and or well maintained equipment is all that's necessary to insure a safe
consistent product.(aside from concerns of some of the flavorings or long term effects of vaping
itself) It's my belief one would have to deliberately adulterate the product with something known
to cause immediate harm to a user for there ever to be a problem to occur. The only other worse case
scenario is bad tasting juice. We certainly wouldn't want to vape it but, if we did it wouldn't hurt us.

Regards
Mike