Straight VG is dang thick. I'd definitely suggest thinning it some, especially for someone who wants to minimize risks. 10% distilled water is will do that, and just as important, it will dramatically decrease the boiling point, thereby helping keep temps lower, which is good if a person wants to avoid thermal decomposition products.Walmart sells Humco brand. For unflavored, zero-nicotine, that's really all you need. Depending on what kind of tank or atomizer you use, you really can just put it in your tank and vape it straight or, if the pure VG is too thick/viscous to wick properly, you can add one or both of the following to thin it out some: