Drugs for happiness

People say that half of the people in the US is using some kind of mental health drugs. I'm quite sure it is not that many, but it certainly is a lot. Especially people who are middle-aged and older, divorced,...
Often, one considers these people inferior, "puppets" without free will because of the influence of drugs on the mind of the user. I used to agree - my mind is the most (the only?) useful thing I have and I do not want to damage it or alter it any way (yeah, I don't do drugs).
However, I don't agree anymore. Many drugs are designed to minimize negative consequences and many are not addictive. And they make their users happy. Why not to use them? If somebody had a difficult life, uncountable tragic experiences and memories, doesn't it make sense to suppress them a little? What's wrong with being simply happy? Who cares that it is not "natural" happiness? The drug user cannot tell and why should people around him care?
I won't start taking them myself, not now anyway. But I think it is an option one should consider. There is just one happiness. And it feels great.