Active ingredient in cannabis protects aging brain cells, researchers find

I see health research a giant jigsaw puzzle (on top of other kinds of puzzles) -- and over time, by examining multiple routs of interaction, we start to see the bigger picture. And find out why, for example, certain substances that are harmful (in some aspects, at certain use levels) can also be tolerated or acclimated to over time (because they can be beneficial to other parts of the system). Especially given that this is not just any substance, but one that our species has been using across cultures and since before recorded history.

And when it comes to conditions like Alzheimer's: if we have to turn over a thousand stones, and do a thousand studies like this to get a working compound -- then so be it. It literally is a trillion-dollar question, in both financial and human (suffering) terms. And yet here we are, still groping around different parts of the elephant in the dark.