Like others who have gone into detail, they all should be legal. It's a crime against humanity making them illegal, locking up tax payers for what? Pleasing themselves while making another person profit(win,win).
Should they all be used? Nope, will they all be used? Nope. When one has access to other less harmful drugs, there really is no need for the more dangerous ones. Yes, more then likely there will still be a select few who use them but in the end, the % of users would be very very small if not none. Especially seeing how selling drugs is based off how much profit one can make, so they may be legal but that does not mean there's someone willing to synthesize them without a high cost.
Should they all be used? Nope, will they all be used? Nope. When one has access to other less harmful drugs, there really is no need for the more dangerous ones. Yes, more then likely there will still be a select few who use them but in the end, the % of users would be very very small if not none. Especially seeing how selling drugs is based off how much profit one can make, so they may be legal but that does not mean there's someone willing to synthesize them without a high cost.