The Record Set: Cannabis

Mortality: zero confirmed direct deaths from cannabis toxicity in the scientific literature. The US National Academies of Sciences: cannabis has not been determined to be the direct cause of overdose death in any study the committee identified.

The LD50 (lethal dose) has never been reached in any documented case.

Violence: no association. THC and CBD reduce agitation. The pharmacological effect is incompatible with violent behaviour. In jurisdictions that legalise medical cannabis, alcohol consumption, opioid overdose deaths, and driving fatalities decrease.

Biology: the endocannabinoid system (ECS). CB1 receptors in the brain (mood, appetite, pain, memory). CB2 receptors in the immune system (inflammation, immune response). The body produces its own cannabinoids (anandamide, 2-AG).

The system evolved over 500 million years. Cannabis couples through an existing pathway. With ageing, the ECS degrades — endocannabinoid production decreases, regulatory functions deteriorate. Exogenous cannabinoid supplementation maintains these functions.

On the evidence of ECS degradation and documented therapeutic effects, cannabis is structural maintenance for the ageing body.

Areas of genuine uncertainty

Adolescent brain development. Cannabis use during adolescence is associated with measurable cognitive effects in some studies.

The adolescent brain is still forming — the prefrontal cortex does not fully mature until approximately age 25. Introducing exogenous cannabinoids during this critical development window may alter neural pruning and connectivity.

The evidence is contested but the signal exists. This is the basis for age restrictions.

Cannabis use disorder. Approximately 9% of users develop dependence (vs 15% for alcohol, 23% for heroin, 32% for tobacco). Lower than alcohol. Not zero.

Cannabis withdrawal is real but not life-threatening (unlike alcohol withdrawal, which can kill).

Psychosis association. High-THC cannabis use is associated with increased psychosis risk in genetically predisposed individuals. The evidence is debated but the signal exists. This is the basis for THC content regulation and screening.

None of these approach the scale of alcohol’s destabilisation on any metric.

The structurally honest response: regulate for these risks (age restrictions, THC content standards, screening for predisposition) the same way alcohol is regulated for its risks.

Do not criminalise a substance whose worst documented effects are orders of magnitude below the legal alternative’s baseline harm.