Why is THC psychoactive and CBD is not? How can one cannabinoid alter the mind so profoundly, and the other seemingly not at all?
When we’re talking about cannabis and psychoactivity, we’re dealing exclusively with CB1 receptors, which are concentrated in the brain and the central nervous system. The difference between CBD vs. THC comes down to a basic difference in how each one interacts with the cannabinoid 1 (CB1) receptor. THC binds well with CB1 cannabinoid receptors. CBD has low binding affinity for CB1 receptors. That’s where the two diverge.
Think of it like an electrical plug connecting to a wall socket. A THC molecule is perfectly shaped to connect with CB1 receptors. When that connection happens, THC activates, or stimulates, those CB1 receptors. Researchers call THC a CB1 receptor agonist, which means THC works to activate those CB1 receptors.
THC partially mimics a naturally produced neurotransmitter known as anandamide, aka “the bliss molecule.” Anandamide is an endocannabinoid which activates CB1 receptors. Animal studies have taught us that anandamide can increase appetite and enhance pleasure associated with food consumption, and it’s likely responsible for some of the rewarding effects of exercise (e.g. the “runner’s high”). Anandamide also plays a role in memory, motivation, and pain. THC is a “key” that so closely resembles anandamide that it activates CB1 receptors, allowing it to produce some of those same blissful feelings.
CBD, by contrast, is not a good fit with CB1 receptors. It’s categorized as an antagonist of CB1 agonists. This means that it doesn’t act directly to activate or suppress CB1 receptors—rather, it acts to suppress the CB1-activating qualities of a cannabinoid like THC. In other words, when you ingest THC and CBD, the THC directly stimulates those CB1 receptors, while the CBD acts as a kind of modulating influence on the THC. As Project CBD co-founder Martin Lee once wrote: “CBD opposes the action of THC at the CB1 receptor, thereby muting the psychoactive effects of THC.”
When we’re talking about cannabis and psychoactivity, we’re dealing exclusively with CB1 receptors, which are concentrated in the brain and the central nervous system. The difference between CBD vs. THC comes down to a basic difference in how each one interacts with the cannabinoid 1 (CB1) receptor. THC binds well with CB1 cannabinoid receptors. CBD has low binding affinity for CB1 receptors. That’s where the two diverge.
Think of it like an electrical plug connecting to a wall socket. A THC molecule is perfectly shaped to connect with CB1 receptors. When that connection happens, THC activates, or stimulates, those CB1 receptors. Researchers call THC a CB1 receptor agonist, which means THC works to activate those CB1 receptors.
THC partially mimics a naturally produced neurotransmitter known as anandamide, aka “the bliss molecule.” Anandamide is an endocannabinoid which activates CB1 receptors. Animal studies have taught us that anandamide can increase appetite and enhance pleasure associated with food consumption, and it’s likely responsible for some of the rewarding effects of exercise (e.g. the “runner’s high”). Anandamide also plays a role in memory, motivation, and pain. THC is a “key” that so closely resembles anandamide that it activates CB1 receptors, allowing it to produce some of those same blissful feelings.
CBD, by contrast, is not a good fit with CB1 receptors. It’s categorized as an antagonist of CB1 agonists. This means that it doesn’t act directly to activate or suppress CB1 receptors—rather, it acts to suppress the CB1-activating qualities of a cannabinoid like THC. In other words, when you ingest THC and CBD, the THC directly stimulates those CB1 receptors, while the CBD acts as a kind of modulating influence on the THC. As Project CBD co-founder Martin Lee once wrote: “CBD opposes the action of THC at the CB1 receptor, thereby muting the psychoactive effects of THC.”


