I hate repeating myself...
The simple point is ANYTHING can be used, or abused, and there is a huge difference between the two.
This is true in drugs, money, sex, etc.
What the issue at hand is:
The right to the pursuit of happiness means man's right to live for himself, to choose what constitutes his own, private, personal happiness and to work for its achievement. Each individual is the sole and final judge in this choice. A man's happiness cannot be prescribed to him by another man or by any number of other men.
These rights are the unconditional, personal, private, individual possession of every man, granted to him by the fact of his birth and requiring no other sanction. Such was the conception of the founders of our country, who placed individual rights above any and all collective claims.
If I choose to use a drug, just because I like it, you have no right, nor reason to attempt to restrict my access to it. If however, I infringe upon your rights while under the influence of those drugs, I should, and will be punished.
Simply put, provided I don't infringe upon your unalienable rights, you should have no say in what I, or anyone else, do.
Why is that simple concept, the very concept of freedom, so alien to many of you?
If this isn't one of the very core things that you were taught as a child, you were robbed and I pity you.
But it's not too late, you can take it back now, and learn to embrace freedom before we have none.