E-cigarettes: research - experiments - ideas

Is there something to pay attention when buying VG?

I see that on the market there are VGs with different purity; some claim that they are 100% VG, some are 99,8%, some are 99,5% and it never says what is the other 0,3% or 0,5%. Does this matter?

Or is it only important that is safe, in terms that it is food grade or that it can be used in cosmetics or...?
 
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