It's not safe to inhale oil vapors, and food grade vegetable glycerin that is 99% pure is the only recommended option for health-related issues. In other words, cooking oils are not suitable for vaping and can be extremely harmful to your health, especially to your lungs. However, if you enjoy the scent of a particular oil, you can opt for a CBD e-liquid with the same aroma. CBD oil for vaping is an excellent e-liquid that can provide you with some health benefits.
It's important to note that VG stands for “Vegetable Glycerin”, and some people might think it's okay to put regular vegetable oil in their vape tank because of this. But all food-grade oils are intended to add flavor to foods, not to be inhaled or heated in a vape tank. Attempting to vape any type of cooking oil is highly inadvisable and could be dangerous. Don't try to make your own vape juice with vegetable oil, thinking it's similar to vegetable glycerin.
Although some vaping juices look similar to food-grade oils and are made with food-grade flavorings, no type of cooking oil is intended for vaping devices and is therefore not safe to vape or inhale. Vitamin E acetate (found in oils such as canola, soy and corn) vaporizes at 363 degrees Fahrenheit, well above the temperatures at which some people vape. Since solvents such as propylene glycol and vegetable glycerin (PG-VG) are often used to administer medications to vapers (from cannabinoids to nicotine), there is always the possibility that a contaminated oil will not completely transform into vapor, but will reach the lungs in liquid form and cause damage. In theory, vape users shouldn't ingest any liquid oil when they inhale, just e-cigarette vapor that looks like white smoke.
If you're a big fan of a particular essential oil scent, consider looking for those scents on e-juice websites and in real vape stores.