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This comprehensive data allowed the researchers to estimate cumulative cannabis use over time and compare it with DNA methylation markers in the participants' blood.

The study identified numerous DNA methylation markers associated with cannabis use. In the 15-year blood samples, researchers found 22 markers linked to recent cannabis use and 31 markers associated with cumulative use. By the 20-year point, they had identified 132 markers related to recent use and 16 linked to cumulative use.

"Interestingly, we consistently identified one marker that has previously been associated with tobacco use," Hou noted, "suggesting a potential shared epigenetic regulation between tobacco and marijuana use."

Implications and Future Research

Several of the epigenetic changes associated with cannabis use have previously been linked to conditions such as cellular proliferation, hormone signaling, infections, and neurological disorders like schizophrenia and bipolar disorder, as well as substance use disorders.

 However, it's important to note that this study does not prove that cannabis directly causes these changes or related health problems.

"This research has provided novel insights into the association between marijuana use and epigenetic factors," said Drew Nannini, an epidemiologist from Northwestern University. 

"Additional studies are needed to determine whether these associations are consistently observed in different populations. Moreover, studies examining the effect of marijuana on age-related health outcomes may provide further insight into the long-term effect of marijuana on health."