I used a fairly popular, legal nootropic and set off a manic episode. Not hypomania (I'm cyclothymic, so I'm used to that and it's usually benign) but scary, saw-code-when-I-closed-my-eyes mania. (It was bad code but at least it wasn't Java.) Also, mania isn't usually "happy"; it's 15% euphoria but 35% anger and 50% anxiety. Based on one episode (eh, maybe two or three; before your mid-20s it is hard to tell) I give the experience 0 stars.<p>Obviously this is not a common reaction, and probably very rare with most nootropics. I just want to point out that there <i>are</i> long-tail risks to this. Although many of these agents are probably safe for the majority of the population, creative and ambitious people are likely to be already a high-risk group.<p>If you're a mathematician or artist or novelist advancing the state of humanity, "enhance" away, and I'll wish you the best in recovery if you get unlucky. If you're a corporate climber and you blow your brain out trying to gain an edge in a zero-sum game, then I have zero sympathy.