THCA (tetrahydrocannabinolic acid) is a naturally occurring compound found in raw hemp flower. In its raw form it isn’t the same as Delta-9 THC. When heated, as happens during vaping, THCA converts through a process called decarboxylation. That’s why heat-based products like a THCA vape are so common in the hemp world. https://trapuniversity.com/product-category/vapes/