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The reduced response to cannabis that develops with regular use, requiring more to achieve the same effect.
Tolerance describes the body's reduced response to cannabis that develops with regular, repeated use. Over time, the endocannabinoid system adapts to the consistent presence of external cannabinoids, requiring higher doses to achieve the same effects that were once produced by smaller amounts.
The Mechanism
When CB1 receptors are continuously activated by THC, the brain responds by reducing the number of available receptors (downregulation) and decreasing their sensitivity (desensitization). Research using PET brain imaging has confirmed that heavy cannabis users show measurably fewer available CB1 receptors compared to non-users. The good news is that this process is reversible: studies show that CB1 receptor density returns to normal levels after approximately two to four weeks of abstinence.
Managing Tolerance
A tolerance break, often called a T-break, is the most effective strategy for resetting your sensitivity to cannabis. Even a short break of 48 to 72 hours can produce noticeable results, though two weeks or more yields the most complete reset. Other strategies include rotating strains to expose your system to different cannabinoid and terpene profiles, microdosing to maintain lower consumption levels, and incorporating CBD-rich strains that do not drive CB1 downregulation as aggressively.