THCA (Tetrahydrocannabinolic Acid) is a compound found in raw cannabis that, when heated, converts into THC — the psychoactive ingredient responsible for the high associated with smoking regular weed. THCA itself is non-psychoactive, but once burned (through smoking, vaping, or cooking), it transforms into THC, giving you the same effects as traditional cannabis. THCA products are legal in many areas, making them a popular choice for those who want the experience of THC in a legal form.