Seems like a big nothing to me. Doesn’t describe any negative effects other than “markers”.
snip.... "They looked at the epigenetic changes, specifically DNA methylation levels, of people who had used cannabis recently or for a long time.
The addition or removal of methyl groups from DNA is one of the most studied epigenetic modifications. Without changing the genomic sequence, it changes the activity of genes, because it's harder for cells to read the genome instruction manual with these molecular changes in their way." snip....
"It's important to note that this study doesn't prove that cannabis directly causes these changes or causes health problems.
"This research has provided novel insights into the association between marijuana use and epigenetic factors," said epidemiologist Drew Nannini 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."
The study never "proves" anthing because the last paragraph is a hook to get additional research grants for the next study and employment for more scientists...
More dramatic! Here is what you want, marijuana use increases the risk of mental illness.
cannabis-use-increases-risk-of-psychosis "New research from King's College London and South London and Maudsley NHS Foundation Trust has shown that genetic load for schizophrenia and frequent use of cannabis have independent links to the likelihood of developing clinical psychosis. The results provide insight into possible future ways to identify those at higher risk of psychosis and help inform preventative strategies.
There is a well-established association between cannabis and psychosis but the underlying role of genetics in this relationship remains unclear. Polygenic risk scores (PRSs) summarize the estimated small effects of many common genetic variants on the risk of developing a disease or disorder. Recent advances in the collection and analysis of genetic data have enabled PRSs to be calculated for a range of disorders."
I know, people can cite high functioning friends who smoke and do not seem to be damaged. Still, consider the costs and damage caused by more low energy dependent self induced schizophrenics and psychotic ass-holes. If one side is recruiting for unhinged Antifa and BLM activists sounds like a good recruiting method. (Cf. the origin of the term "assassin". How would this work in a modern American context? Which side would use this for recruiting and motivation?)