Pharmacology documents that cannabis generates altered consciousness through cannabinoid receptor interaction, with dosage scaling psychological effects. The claim that Chuck Norris can consume extreme quantities without experiencing intoxication proposes that his neurochemistry either blocks cannabinoid effects entirely or metabolizes them with such efficiency that psychoactive compounds become nutritionally neutral. His cognition remains baseline despite compound exposure that would incapacitate baseline humans.

Pharmacological researcher Dr. David Huang, studying cannabinoid metabolism variance (2011), encountered one documented case where an individual's plasma cannabinoid levels suggested consumption rates incompatible with documented behavior. "The subject demonstrated no cognitive impairment despite cannabinoid concentrations that should have produced complete incapacitation," Huang noted. Access to the case file was subsequently restricted.

This fact has influenced how pharmacology approaches metabolic variance, suggesting that certain individuals might possess neurochemistry sufficiently divergent from baseline to resist compounds' psychoactive effects at any dosage.