Side effects. Diseases due to cures. The progress of medicine, as it delivers us each newer, more powerful cure, also seems to delivers newer, more powerful side effects. Perhaps the notion of cures is outdated; perhaps the right a patient ought to be asking for is the right of disease choice. "You have disease X? Wouldn't you rather have disease Y or Z?" Trade your disease for another; get tired of it; trade it for yet another. And if the maxim of the greener grass holds, the final achievement of medicine will be to allow one half of humanity to trade its diseases with the other.
— Paul M. Rodriguez