I would go further and say that none of the addiction is related to psychedelics - AFAIK you can't get addicted to then.
As with alcohol etc you can do stupid and dangerous things while on then, and you can have a very unpleasant experience but they are otherwise harmless.
Addiction is not necessarily physical. Pretty much anything which makes people feel good or different can trigger addictive behaviour e.g. gambling, video games, or shopping, all have related compulsive disorders which get more and more considered as addiction as time passes and studies increase (though only gambling addiction is formally recognised by the DSM at this point).
Psychedelic pharmacology pretty much ensures that the vast majority of people will not become physically addicted to the substances, as opposed to substances like nicotine, alcohol, opioids or amphetamines.
5-HT2A agonism induces a rapid tolerance, making it difficult to dose many times in a two week period. A second dose or more within that period will have vastly diminished returns.
Psychedelics can be addictive in the same way Magic: The Gathering can be addictive, but not so much in the same way that physically addictive drugs are.
As with alcohol etc you can do stupid and dangerous things while on then, and you can have a very unpleasant experience but they are otherwise harmless.