I remember not too long ago an e-liquid manufacturer put titanium dioxide in his Unicorn Milk for that opaque look. There have also been some people putting dyes in their e-liquids that are not certified for inhalation. A very small number are using 'natural' drug extracts. In 2013, a nicotine supplier in the US and a promoter of this site went and sold a batch of diluted oxidized nicotine. Another nicotine supplier here sold a poorly mixed batch that ranged from 8% to 15% nic between the bottles. These people lack basic food product manufacturing knowledge. They practice zero quality control on their ingredients for consistency and contamination and only practice, "It looks to me Jim." QA on their products. When you see something is 98% pure, you have to know what that other 2% is. People that are not invested in a proper ISO certified manufacturing facility are accidents waiting to happen. Dr. Farsalinos has been harping on this ingredient problem since the beginning. And it is the reason I have only bought one bottle of premade juice. I DIY so I can control my suppliers.
Titanium dioxide is found in virtually every paint and premixed texture. It's used for marking
athletic fields. It's used in foods for coloring. It is considered safe for human consumption.
However like asbestos,,acetyl and silica sand it is a occupational hazard and creates lung
related issues when used in large concentrated amounts.
The use of natural Drug extracts? Really.
-8% to +15% between bottles seems like a lot. Do you mean one bottle was
8mg pml and one 15mg pml?, or 100mg pml nic base that varied -8 to plus 15%
per ml? At either rate nothing remotely dangerous. False advertising. Violations
of weights and standards perhaps. One should always error to the plus side.
The point is variations such as these are common in the manufacturing of
consumable products and do not pose a health threat in and of themselves.
some people may notice a difference. Most do not.
Now lets address these mysterious contaminants. Name one.
When a bottle of PG/VG,flavors and nicotine says 98.5% pure that means
the 1.5% remaining is 99.99% water and may contain trace amounts of
things in such low quantities as not to be measurable and or not harmful
in any amounts found. I am willing to even say I do not believe anyone
is using street run off for base and parking lot sweepings for thickeners.
The companies making these raw products also supply the food,drug and
cosmetic industries to name a few. Whats on the bottle is what you get.
Anyone using raw materials not deemed fit for human consumption is
breaking the law. To my knowledge no one has been hospitalized from
buying poisoned juice. Unless the nic level gets outrageously high the
only possible bad outcome is bad tasting juice. I would not vape it if it
tasted bad. I would not eat spaghetti if it tasted bad. Wait, I have never
found bad tasting spaghetti. There's my spaghetti and all those second
place finishers.

Regards
Mike