In the recent past, most growers concentrated on cultivating strains that were high in THC. In fact, over the years they kept getting higher and higher. Most marijuana strains carry around a 18 percent THC to 1 percent CBD ratio (sometimes THC is even higher at 20 percent and beyond). But due to the popularity of CBD skyrocketing in recent years, the demand for strains that provide more of the health benefits associated with CBD has grown exponentially. As such, many growers have turned to breeding THC strains into CBD strains to keep up with what people want and provide them with a wide variety of options.