A common term used when speaking of hemp-based products are terpenes. Terpenes are aromatic compounds found in the naturally occurring oils of every plant, herb, and flower. There are more than 20,000 in existence of which around 100 can be found in most strains of the cannabis plant.
The role of terpenes in relationship to cannabis is to naturally attract us, through our sense of smell, to the products that our individual endocannabinoid system will best respond to. Think of it like a pheromone that attracts you to your partner. Terpenes also attract pollinators with their scent. Every strain of cannabis has a different variety of terpenes and the products (both THC and THC-free) that smell the most appealing are likely the ones that will best meet your needs.