Practical and advantageous applications of intentionally inducing psychotic episodes
A chemical imbalance in the temporal lobe, (or the over-production of dopamine and; subsequently, epinephrine) allows you to use your muscles' full motor-performance.
Increased dopamine production in a certain area of the brain can improve skill-related cognitive speed (synaptogenesis) and capacity (neurogenesis) in that region of the brain - but at the risk of causing psychosis and other neurological abnormalities (because of the dope).
Neurosis/narcissism/megalomania; the condition of being greedy, selfish, and possessing a sort of perpetual discontent with your current circumstance and a tendency to automatically develop resentment towards other people's opinions or beliefs (because they're not your own), makes you more competitive and less lazy. Constantly trying to one-up everybody; you've a far greater chance of achieving your fullest possible level of productivity. Although this productivity is the result being paranoid that someone is going to get ahead of you.
In a catatonic state, you're disassociated from reality; in such a state you could be burning to death and you wouldn't even realize it. It's a good way to survive torture if you can induce it intentionally.
Multi-personality disorder can allow you to create a persona and withhold information from his memories. Useful if you don't want to divulge information while under the gun.
If you meditate 2 hours per day, for 90 days, you will be able to hallucinate during meditation (due to the increased levels of dopamine available on call). If you're already suffering from MPD - you may be able to select a certain experience, perhaps an altered memory; and go into a personality that has no knowledge of you creating that experience nor any recollection of its content. You won't realize that you were just now meditating, so you won't be able to tell that it's just a dream. This allows you to warp your own subjective reality, achieving nirvana. You may as well be living a lie, but a good lie, one in which you look better and have more money, for example. It's using hypnotism (something marijuana automatically does to you) to cause amnesia while engaging in a lucid dream, unfolding by the design of your conscious as opposed to your unconscious. You're distorting what's actually going on around you. This is a good way to spend your free-time. It's the best form of leisure, when you go back into your base-personality you'll automatically recall that the experience wasn't real so, no harm done.