I have tried to find these "daming" studies but have not come up with any information, nobody is reporting that smoking cannabis is doing damage to the brain. No studies that I read showed any evidence of damage to the nervous system. There are physiological differences in smokers brains with schizophrenia, but these difference don't point to damage, simply put they are changes in brain volume and grey matter which differ from smokers to non-smokers. The best I can do is say that we know that things like alcohol and other substance clearly affect us in much more detrimental ways than cannabis could ever accomplish. The study that first sent me down this rabbit hole about a decade ago was this gem by the DOT : http://ntl.bts.gov/lib/25000/25800/25867/DOT-HS-808-078.pdf
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Awesome, thanks for the info! That study jives well with my own observations: people who drive high may be slightly impaired, but they're usually aware of it and much more risk-averse than usual. They never seem unsafe to me.
Oh, without a doubt, the double-standard is so blatantly obvious, it's a joke that forgot to be funny. Alcohol is known to damage the brain, but even that we now know is fixable if you're taking proper care of yourself.
Even so, when I tell friends and family that weed isn't bad, I do have to caveat that with "but think of the children" with current information. The more I dig into that, though, the less I find to substantiate even that special case.