THC: THC is the cannabinoid best known for causing intoxication or a “high”. NHS public guidance says it is the chemical in cannabis that makes people high, and also notes that the more THC a product contains, the greater certain risks can be.
It is one of the most important patient terms in the whole glossary.
In UK driving law, THC sits within the zero-tolerance-style specified-drug framework, though a medical defence may apply if the medicine is prescribed and taken correctly.
THC content is highly relevant to impairment, psychiatric side effects, dependence risk and driving discussions.