No. Bad. Terrible for developing brains. It blocks cannabinoid receptors, and we don't even fully know how they work in the brain, just that they are important. Further, you can't put a developing brain in an altered state regularly and not expect it to screw up how think down the road. Adults can occasionally lose their minds when they first try a new drug, especially hallucinogens, and while cannabis is less severe, it is actually considered to have minor hallucinogenic properties. Then there are carcinogens and the general effect of consuming this in whatever method they used (smoke, hot vapors, digestion). Then there is how is will effect their personality growing up (after having been in altered states far too early.
This is bad for the cannabis movement