05/29/2026
A large Danish cohort study examined whether long-term C*nnabis exposure was associated with lasting cognitive decline. Researchers analyzed data from 5,162 men born between 1949 and 1961, comparing intelligence test scores taken in early adulthood with follow-up assessments decades later.
The results did not show greater long-term cognitive decline among participants who reported use. In fact, the average difference between groups was small, about 1.3 IQ points, and slightly favored those with reported exposure. Researchers noted that the study relied on military examination data, which is why only men were included.
Scientists emphasized that observational studies cannot prove cause and effect. Socioeconomic background, education, lifestyle factors, and overall health may all influence long-term cognitive outcomes.
Other research from Australia and the United States has reported similar findings, though experts continue to call for broader studies that include women and more diverse populations.
The Danish findings contribute to ongoing scientific discussion about long-term brain health and controlled compound exposure, highlighting the importance of data over assumption.
➡️ Note: This content is shared for academic interest, based on scientific studies and historical records. It does not promote, sell, or encourage recreational or non-medical substance use.
