Not everyone who tries drugs becomes an addict:

For the record, I have tried - once - almost every drug and liked none, disproving the popular Fu Manchu theory that a single whiff of opium will enslave the mind. Nevertheless many drugs are bad for certain people to take and they should be told why in a sensible way.

The legalization of drugs will not lead to the mass addiction of the populace:

Now one can hear the warning rumble begin: if everyone is allowed to take drugs everyone will and the GNP will decrease, the Commies will stop us from making everyone free, and we shall end up a race of Zombies, passively murmuring "groovie" to one another. Alarming thought. Yet it seems most unlikely that any reasonably sane person will become a drug addict if he knows in advance what addiction is going to be like.