What’s in vape oil?

Vegetable glycerin is the same stuff used in over-the-counter cough syrup (along with a variety of other products, including fast food eggs). You can purchase it for $35 a gallon on Amazon. Vegetable Glycerin Food Grade 99.7+% Pure Kosher – 1 Gallon

Any drug can be dissolved in glycerin to vape in an eCig, and unflavored codeine syrup can be vaped straight out the bottle.

Hash oil is something different entirely, and you won’t be able to make a decent one at home. In dispensaries, it’s difficult to tell what’s hash oil, and what’s cut with glycerin, coconut oil, etc. 

As a general rule of thumb, anything at 60% THC or higher is probably pure (minus pesticides, and other things not tested for since it’s not federally legal yet) hash oil. Hash oil percentages should be in the same range as shatter, wax, and other concentrates, as the extraction process remains the same, but with another added processes during curing to affect the viscosity so it can be absorbed by the wick.

Of course if you live somewhere like Phoenix, AZ, you can just go outside and melt any concentrate enough to soak into a tank wick.

All of this is assuming you want to use the same tanks and juice as a nicotine vaporizer. 

Because just about every eCig battery and mod has an adapter to vape dry herb, and another to vape concentrates. Your local smoke or vape shop should have these (and if they don’t, another one in town does). They can also be ordered online overseas like all vape equipment, as none of it is made in America – just imported and branded.