THC also exists as its isomer delta-10. They form isomers despite having the same chemical composition because of their different molecular structures. They have a similar chemical makeup, yet they have other functions. Like delta-8-THC, low levels of delta-10 can be found in nature. Concentrations of 100% pure delta 8 vs delta 10 are almost unachievable. CBG and CBC are added to increase the cannabis content. At Fusion Farms, where crystals had formed on the impacted cannabis, delta-10 was discovered.