None of this is certain, none of this was precise, but the study still highlights the need for more research.
I still feel its imperative that scientists primarily focus on our diets - our eating frequency, activity levels, digestion, metabolism, and the food we eat itself over demonizing cannabis unfairly.
There is no mechanism or pathway the authors have proven exists that cannabis or a particular cannabinoid damages the endocrine system/etc. by itself.
And nowadays, with all the synthetic cannabinoids on the market (especially in Europe to avoid laws), these studies will only become more inaccurate unless participants are carefully selected.
Especially in Europe where cannabis is illegal, people have no idea what they are actually consuming - it's like the US/et. al spice craze. Manufacturers are constantly changing things up to avoid laws and all people care about is getting high. Even here in the states, people are inhaling/consuming chemical soup if they live in an illegal state and don't know any better.