Should all drugs be legal?

I’m surprised that no one made this question before. The question is quite simple, though it generates an interesting debate.

I think that all drugs (and I mean, ALL of them) should be completely legal for adults to buy and consume, as I think no one is in the position of telling an adult what he should do with his own life.

Though, this means, of course, that he would have to take all the responsibilities involved in case of a crime (drugs would be no excuse for killing, speeding, hit and run, etc, etc).

A lot of people consume a lot of different drugs in a mature way, such as alcohol. We wouldn’t ban alcohol because of the thousands of deaths it causes, because we think that the problem is not the alcohol per se, but the person who abuses it. Hence my viewpoint to other, now illegal, drugs.

What do you think?