Recreational Drugs Triple Stroke Risk in Young Adults, Major Study Reveals

Recreational Drugs Triple Stroke Risk in Young Adults, Major Study Reveals

Recreational drugs including cannabis, cocaine and amphetamines could significantly increase the risk of stroke in young people, according to a comprehensive new study from the University of Cambridge. The research suggests that using these substances, particularly amphetamines, could nearly triple the risk of stroke in individuals under the age of 55.

Alarming Statistics and Public Health Implications

Stroke remains the third leading cause of death and disability combined in the United Kingdom, affecting approximately 100,000 people every year according to the Stroke Association. While lifestyle modifications such as maintaining a healthy diet, regular exercise and smoking cessation are well-established methods to reduce stroke risk, this new research highlights the substantial danger posed by recreational drug use.

Dr Eric Harshfield, from the Department of Clinical Neurosciences at the University of Cambridge, emphasised the significance of the findings: "Our analysis suggests that it is these drugs themselves that increase the risk of stroke, not just other lifestyle factors among users. Taken together, our findings emphasise the importance of public health measures to reduce substance abuse as a way of helping also reduce stroke risk."

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Comprehensive Analysis of 100 Million People

For the study published in the International Journal of Stroke, researchers conducted a meta-analysis of studies involving approximately 100 million people. The analysis revealed that cocaine and amphetamines were found to double the overall risk of stroke – with cocaine increasing the risk by 96 percent and amphetamines by 122 percent. Cannabis use was associated with a 37 percent increased risk.

When researchers specifically analysed data for people under the age of 55, the results were even more striking. Amphetamine use almost tripled the risk of stroke with an increase of 174 percent, cocaine use increased the risk by 97 percent, and cannabis use elevated stroke risk by 14 percent.

Biological Mechanisms Behind Increased Risk

Study authors explain that recreational drugs could trigger strokes through multiple biological pathways. These substances can cause sudden spikes in blood pressure, blood vessel spasm and constriction, heart rhythm problems, increased blood clotting (particularly with cannabis), and inflammation or vasculitis (especially with amphetamines).

The analysis further revealed that disordered cocaine use was specifically associated with brain haemorrhage and cardioembolic stroke, which occurs when blood clots form in the heart and travel to the brain. Cannabis use disorders were linked to stroke overall, with particular association to large artery stroke.

Current Drug Use Patterns in the UK

According to Office for National Statistics data published in 2025, approximately 8.7 percent of people aged 16 to 59 years (roughly 2.9 million individuals) and 15.1 percent of people aged 16 to 24 years (around 899,000 people) reported using "any drug" in the past 12 months. These statistics highlight the scale of potential public health impact identified by the Cambridge researchers.

Dr Megan Ritson, from the stroke research group at the University of Cambridge, commented on the significance of the findings: "This is the most comprehensive analysis ever conducted on recreational drug use and stroke risk and provides compelling evidence that drugs like cocaine, amphetamines, and cannabis are causal risk factors for stroke. These findings give us stronger evidence to guide future research and public health strategies."

Comparative Risks and Research Limitations

Interestingly, researchers found no significant link between opioid use and stroke risk in their analysis. The study also provides important context for comparative risks – smoking, for example, is known to triple stroke risk by damaging blood vessels and increasing blood pressure, similar to the effects observed with recreational drugs.

While previous evidence has suggested recreational drugs may increase stroke risk, most came from observational studies that couldn't definitively establish causation. This new meta-analysis provides stronger evidence of a direct causal relationship between specific recreational drugs and increased stroke risk, particularly among younger populations.

The research underscores the urgent need for targeted public health interventions and educational campaigns aimed at young adults who may underestimate the serious cardiovascular risks associated with recreational drug use. As stroke continues to represent a major cause of death and disability in the UK, understanding and addressing all modifiable risk factors remains crucial for improving population health outcomes.