It's an interesting theory when you think about it. What is Happiness in its most biological sense?
The brain receives information that is converted into electrical impulses. These impulses electrifies and stimulates the organ that is your brain which in turns releases certain chemicals. The balance of these chemicals are crucial. When they secrete and rush into your system, its euphoric. The initial surge makes you smile wider than you normally would, makes your heart palpitate a bit faster, and sends a tingle through your body. The body, once used to the chemical flux, will return to a sense of calm, but a pleasant one.
Is this Happiness? If so, then a drug will give you the same result, no?
Then why the term 'The pursuit of happiness'? Does the body look for happiness? Do we as beings need it so badly that we have to search for it? Search for images, smells, sounds, anything discernable that will fill a void in our chemical make up?
Is it a constructural flaw? Are we built to search from the get-go?
Happiness can come in so many forms, but ironically it never comes, it must be sought. I've found mine. I hope you find yours.