I did read the study, and while it clearly spells out that effect wane after one week in many cases, it remains completely vague on any persistence of long term

I did read the study, and while it clearly spells out that effect wane after one week in many cases, it remains completely vague on any persistence of long term effects under abstinence. I've searched for the words day, week, month and year and there is absolutely no clear cut result to the end of persistency of THC/CBD effects. What the study does clarify though is that the cohorts in most studies were small and that more research is needed for more tangible results. The one positive advise, well hidden, is to counsel youth about unhealthy usage patterns, i.e. chronic canabis abuse. A lot of fluff around no solid findings. Which is a statement in and by itself.