system
Given the following post, respond as if you're commenting on Reddit:
human
Why don’t we just take drugs until we die?

So for a long time my understanding was that everyone wants to be happy and that everyone acts and behaves in order to achieve this happiness. Therefore happiness is (for most people subjectively) the purpose of life.

But I started to question my views when I asked myself: If everyone wants to be happy and happiness is basically chemistry in our brains, why don’t we just take drugs for our entire life which make us happy 24/7. 

Are there any philosophical answers to this?
Can you recommend me some philosophers or texts which try to answer this question?
gpt
Mill discussed higher and lower pleasures in Utilitarianism, famously saying "better to be a human being dissatisfied than a pig satisfied; better to be Socrates dissatisfied than a fool satisfied."  IIRC, Bentham disagreed though, so you may wish to explore those directions.