Recent scientific studies have raised concerns about the potential long-term effects of continued cannabis use into adulthood, particularly around the age of 30. While cannabis is often perceived as a relatively harmless substance, emerging research suggests that prolonged usage may be associated with various cognitive, psychological, and physiological challenges.
Cognitive Impairments
A study published in JAMA Network Open in February 2025 examined the impact of heavy cannabis use on working memory among adults aged 22 to 36. The researchers found that 63% of heavy lifetime cannabis users and 68% of recent users exhibited reduced brain activity during tasks involving working memory. Working memory is crucial for daily functions such as decision-making and attention. The study’s lead author, Dr. Joshua Gowin, emphasized the importance of understanding cannabis’s effects to inform public health decisions. People.com+1New York Post+1Futurism+2New York Post+2People.com+2
Similarly, a report from Harvard Health Publishing highlighted research indicating a link between long-term heavy cannabis use and cognitive decline in midlife. The findings suggest that chronic use may lead to impairments in learning and memory, underscoring the need for further studies to explore the potential risk of developing dementia. Harvard Health
Mental Health Considerations
Long-term cannabis use has also been associated with mental health challenges. A study published in Springer estimated the long-term effect of initiating marijuana use in adolescence on several mental health outcomes later in life. The researchers found that early initiation of cannabis use was linked to adverse mental health outcomes, including increased risk of psychiatric disorders. SpringerLink+2SpringerLink+2SpringerLink+2SpringerLink+1SpringerLink+1
Physical Health Risks
Beyond cognitive and mental health concerns, prolonged cannabis use may pose physical health risks. Research led by Columbia University found that individuals who consume cannabis products have higher levels of heavy metals, such as cadmium and lead, in their bodies. These metals can have detrimental effects on overall health, raising concerns about the long-term safety of cannabis consumption. Futurism
Conflicting Findings
It’s important to note that not all studies align on the negative impacts of prolonged cannabis use. For instance, a recent study by researchers in Copenhagen suggested that the age at which men start smoking cannabis has no negative bearing on cognitive decline later in life. The research also indicated that frequent adult users did not show greater cognitive decline compared to non-users. Futurism
Conclusion
While some studies present conflicting findings, the prevailing body of research suggests that continued cannabis use into adulthood, particularly around the age of 30, may be associated with cognitive impairments, mental health challenges, and physical health risks. As cannabis becomes more widely accepted and legalized, individuals should remain informed about potential long-term effects and consider moderating use to mitigate associated risks.
