Yep. Dr. Daniel Amen has published a book titled - Change Your Brain, Change Your Life - which has many brain scans within its pages. One is of a long time user of marijuana. The holes in that person’s brain, and by holes I mean there is no longer synapse activity, is no different than an alchoholic’s brain.
Don’t just take my word for it, varyouga; go look in the book for yourself.
Of course, it is best to scare a concerned drug user away from using drugs. Much the same way a babysitter can scare a child into staying indoors instead of exploring outside. “You’ll get abducted by the boogeyman, sit home and play video games instead”.
Here’s a good website on research fraud with a few articles featuring this guy. I have been in research and was disgusted with the amount of lies in most organizations. http://www.quackwatch.org/
After extensive personal experience knowing many mathematicians, scientists, business owners and engineers that have smoked for decades with no harm, I very firmly believe it is BS and affects each person differently. I also know almost as many people that say cannabis affects them badly and do not smoke it by their OWN CHOICE.
Alcohol is 100% proven to cause brain damage in extreme addicts. Should we incarcerate every person for holding a beer?