Volatile Aromatic Compounds

Volatile Aromatic Compounds (VACs) are the organic molecules that evaporate readily at room temperature, creating the distinctive scents associated with cannabis. These include terpenes (monoterpenes and sesquiterpenes), esters, alcohols, and sulfur-containing compounds that form during plant development and are stored primarily in trichome glands. VAC profiles vary dramatically across cultivars and are influenced by genetics, cultivation conditions, harvest timing, and curing methods. Breeders and researchers use VAC fingerprinting—gas chromatography analysis—to characterize and stabilize aromatic phenotypes within lineages. Understanding VAC composition helps distinguish between strain families and track chemical consistency across generations, though volatile profiles can shift significantly post-harvest.

Breeders select parent plants based on VAC profiles to establish consistent aromatic signatures within stable lines. Stable VAC expression across multiple generations often indicates both genetic fixation and environmental repeatability, making it a useful marker for breeding true-to-type cultivars.