Recreational drugs, including those considered mild, more than double the risk of stroke, according to an analysis of medical data from over 100 million people. Researchers identified significant variations in risk across substances, with none showing positive outcomes.
Key Findings on Stroke Risks
Amphetamine use links to a 122% higher stroke risk, while cocaine users face a 96% increase. Cannabis consumption correlates with a 37% elevated risk.
“Illicit drug use represents a preventable stroke risk factor, yet many young people remain unaware of its severity,” states Megan Ritson, research associate at the University of Cambridge. “These results mark the first clear demonstration of how various substance use disorders affect stroke likelihood.”
Understanding Strokes and Research Methods
A stroke occurs when blood flow to the brain disrupts, either from a clot blocking vessels or a vessel rupture. Deprived of oxygen and nutrients, brain cells die rapidly. Strokes rank as the third leading cause of death and disability worldwide.
Researchers confirmed correlations by reviewing extensive medical records. To isolate drugs as a causal factor beyond lifestyle confounders, they applied Mendelian randomization, examining genetic predispositions to substance disorders alongside stroke incidence. This approach strengthens evidence that the drugs directly elevate risk.
Heightened Dangers for Younger Users
Among individuals under 55, amphetamines triple stroke risk, cocaine boosts it by 97%, and cannabis raises it by 14%.
Mechanisms Behind the Risks
Amphetamines elevate blood pressure and constrict brain vessels. Cocaine accelerates artery cholesterol buildup. Cannabis narrows vessels and may promote clotting.
“These substances impose severe stress on the cardiovascular system, fostering clotting, vessel narrowing, and circulatory damage—all stroke precursors,” notes Juliet Bouverie, head of the Stroke Association. “Routine cocaine use also drives high blood pressure, behind about half of all strokes.”
Opioids and Other Considerations
The analysis detects no significant stroke risk from opioids. However, opioids remain highly addictive, contributing to nearly 80,000 overdose deaths in the US in 2023.
These insights underscore the cardiovascular hazards of recreational drug use across populations.
