In fresh cannabis – cannabinoids are initially produced as acidic cannabinoids – meaning there is a carboxylic acid functional group on the molecule’s backbone. When heat is applied to an acidic cannabinoid – this carboxylic acid functional group is driven off – and the molecule is converted to its ‘neutral’ counterpart in a process known as decarboxylation. In the case of THCA-a (THC-acid) –heat converts THC-a to delta-9 THC. It should be noted that acidic cannabinoids are not physiologically active in the same way their neutral counterparts are active. In other words, THC is psychotropic and 'gets you really high' whereas THC-a, while full of benefits, is not considered psychotropic, and thus, does not 'get you high.'