We can know this: pot IS profoundly psychoactive. Also, anything inhaled through the lungs such as pot/cigs/cocaine/etc. near-rivals IV administration for blood saturation and IS more addictive than eating/chewing the product au naturel (e.g. pot brownies, coca leaves).
Some people bond with marijuana and become functionally addicted. Are they physically addicted as with heroin? No, but so what? Come Hell or high water they WILL get their pot! And it ain’t cheap.
Pot is far cheaper than alcohol for an evening of partying. Even when illegal.
You can also carry enough pot and papers in your pocket to get 50-100 people stoned for an evening. You'd need a small truck full of booze for that.
There is also far less of a hangover and it will never make you feel sick like alcohol. Most people would prefer pot if not for the legal issues.
The alcohol companies (and Feds taxing them) are terrified about legalization. Imagine if millions of people simply grew a plant and never paid a dime for alcohol again. This is a huge incentive to maintain SWAT raids on potted plants and make desk clerks pee in jars.