Anecdotally, as a college student in a state where marijuana is still extremely illegal, it is comically easy to obtain it while alcohol, a legal drug, is significantly more difficult to obtain (though still easy).
Following this pattern, from what I've seen psychedelics are relatively simple to get (albeit harder than weed), therefore legalization might actually make them more difficult to illegally obtain because dealers will be replaced by controlled medical practices in many markets.
Decriminalization will also open doors for people to study _how_ they affect the brain.
Illegal drug dealers have very little incentive not to sell to underage kids, while legal ones have a license and livelihood that could be taken away.
Of course legal drugs always have “cool” adults willing to be straw purchasers for underage kids. It’s complicated, and the relationship between the law and underage usage are non linear.
It'll probably remain at least slightly easier to get drugs than alcohol even if/when both are legal to 21+ just because drugs are so much smaller and easier to deal with. A trunk full of Alcohol isn't much but a trunk of any drug is a lot.
Following this pattern, from what I've seen psychedelics are relatively simple to get (albeit harder than weed), therefore legalization might actually make them more difficult to illegally obtain because dealers will be replaced by controlled medical practices in many markets.
Decriminalization will also open doors for people to study _how_ they affect the brain.