CO² oil is commonly made using pressure and carbon dioxide to separate plant material. This method, called supercritical fluid extraction, is one of the most effective ways of reducing cannabis to its essential compounds. The end result is a pure and potent THC oil, which can be very effective for those with a high tolerance to cannabis. Vaporized cannabis can have a lot more THC, which increases the risk of poisoning, and the high temperatures used may expose the smoker to toxic substances.¹. ¹Cited from California Dept. of Public Health’s Let’s Talk : Cannabis – Responsible Use of Cannabis