When their doctor switched them to a highly purified CBD-only oil, these symptoms immediately disappeared, and their epilepsy remained controlled. A takeaway from this study, and other research suggesting that up to one in five CBD oil products could be contaminated with detectable amounts of THC, is that side effects from over the counter CBD oil products might not actually be due to the chemical action of CBD.
There has been a raised concern of the effects and hidden dangers of inhaling the chemical propylene glycol, which is widely used to mix with CBD vape oil. Propylene glycol is a thinning compound and is also the primary ingredient in a majority of nicotine-infused e-cigarette solutions. At high temperatures, propylene glycol converts into toxic nanoparticles which are known for causing damage to respiratory organs and said to cause cancer, asthma, and other illnesses.