Cannabis Resources

Evidence-Based Cannabis Research

Cannabis is often presented as harmless, or even beneficial, yet the scientific record points to serious and wide-ranging harms. From mental health and violence to birth defects and environmental damage, the evidence challenges the popular narrative around legalisation and normalisation.

This collection gathers peer-reviewed studies, expert summaries, and explainer videos that together build a clear, evidence-based picture of cannabis-related harm. The resources are grouped by theme so readers can move straight to the area most relevant to them.

Epidemiology

Population-level research mapping the disease burden linked to cannabis, including cancers and birth defects, alongside summaries from leading epidemiologists.

Cannabis and Violence

Studies examining the relationship between cannabis use and violent behaviour, including mass violence and violence between intimate partners.

Cannabis and the Environment

Cannabis cultivation carries a significant and often overlooked environmental cost. This research looks at its impact on water and wildlife.

Cannabis and Children

Evidence on how cannabis affects children, from developmental damage to accidental poisoning in the home.

Cannabis, Workplace and Secondhand Smoke

How cannabis affects safety in the workplace and the health of bystanders exposed to secondhand smoke.

Cannabis – Social Justice Considerations

An examination of the social-justice arguments frequently used to support changes to cannabis policy.

Cannabis Science Videos

Short, accessible videos that summarise the documented harms of cannabis for a general audience.

Why This Matters

Sound drug policy depends on an honest reading of the science. The studies and summaries gathered here show that the harms of cannabis are real, measurable, and far-reaching. OVOM shares them to support prevention-focused policy and to help families, educators, and decision-makers stay informed.