Cannabis contains hundreds of natural chemical compounds known as cannabinoids, including tetrahydrocannabinol (THC) and cannabidiol (CBD), that are made and stored in the plant’s trichomes.
THC is responsible for the feeling of intoxication (the ‘high’) that’s sometimes experienced when people consume cannabis. To find out the THC potency of a product you can see the concentration of THC shown on the label as a percentage of THC by weight (in dried flower and concentrates such as shatter), by volume in an oil (mg/ml), and as a total amount in edibles and beverages.
Some people prefer to consume products that are higher in the cannabinoid CBD than THC. CBD does not cause intoxication, and may mitigate some of the intoxicating effects of THC when consumed in cannabis that has a higher CBD to THC ratio (at least 2:1). Some products identify the ratio of THC to CBD (for example, products labeled 1:1 contain equal amounts of each).