Marijuana growers in North America, Europe and elsewhere have one goal in mind: getting high. The more THC, the better.
Over time, the domestic gene pool has shifted. The war on drugs drove growers indoors. Indicas don’t grow as tall as sativas and they have shorter flowering periods. Sativas fell out of favor. Breeders created hybrids. Heirloom (landrace) strains became less popular, if grown at all.
Today’s pot is often over 20% THC. In the pursuit of a good buzz other components including cannabidiol (CBD) have been lost.
CBD is responsible for many of the pain and healing effects atributed to cannabis. While THC has medicinal value, it is often overshadowed by CBD. CBD-rich cannabis strains are rare and sought after by MMJ patients seeking relief.