There was one question notable for it not being asked. What are my chances of becoming a cannabis abuser or chemically dependent on the drug?
There is no known answer either, but having worked with chemically dependent people through a rehabilitation facility, I do know a few thing we do know and some we do not.
I did some collation of alcohol abusers and their character types. Small sample to be sure 32 of the 32 people as alcoholics, that is chemically dependent on alcohol were of the Intuitive group, NT or NF character types. The same test could not be done with cannabis abusers because there were none in the facility for treatment that were not also abusers of some other substance.
The facility had a track record of successfully treating high percentage of the alcohol abusers. The track record at the time was non existent for successful treatment of cannabis/other patients, or there were no known clean prior patients.
Another reason it is difficult to characterize cannabis/other group is the motivation for being treated. The alcoholics I tested either were persuaded to seek treatment or did it on their own. They self identified as chemically dependent alcoholics. Those that were forced into treatment were tested but not tabulated because that could, probably would skew the results. They could not be accurately identified as alcoholics. Very few people forced into treatment ever successfully avoid abusing the chemical of choice again.
There is a difference between a drunk and an alcoholic. The drunk drinks when they want to and can turn it off when they wish. The alcoholic does not have this control until the long term affects of abuse have been given time to subside before real choice is available. So that leaves 75% of society as probably not being susceptible to becoming an alcoholic, and 25% that could but do not understand their risk.
If you google "Cannabis abuse rehabilitation" you will find a long list of scholarly articles available to read, none that taut successful rehabilitation, and that is my experience. I suspect it has to do with character type, just as it does with the alcoholic, but also the affects of the drug do not lead the abuser to want or seek treatment. However, that does not mean they do not become impaired by long term abuse of the drug, it seems to mean, they just don't give a shit.
I find it deplorable that we will now legally add this additional road bump in the way of our children with blessing of society, without understanding the consequences.