Using amphetamines/cocaine is mental doping. You are trying to enhance your ability to think faster, read more effectively, concentrate more strongly and for a longer period of time. I guess some other external tool to allow lawyers to more quickly and thoroughly understand the twisted rhetorics of say, Judge Posner.
Yet, the fact remains that such stimulants are much like the performance enhancing anabolic steroids for athletes. The deleterious side effects of testosterone, for example, are very bad indeed. Carcinogenesis. Increased atherosclerosis. Impotence. Among other things. In women testosterone along with building muscle, causes a permanent loss of feminity. Facial hair. Lowering of the voice. Infertility. Some pretty bad things to endure just to be competitive.
All athletic programs at all levels are very correct to ban all illegal drugs in their sport. Street drugs and anabolic steroids to be sure. I can remember in high school our football and basketball coaches forbidding us to smoke and drink alcohol. Eventually of course demon Rum became a part of our lives, but many of us were spared serious disease by never smoking. To those coaches I say thank you and Amen. Anabolic steroids work. They build muscle. They kill and harm health. Cocaine works. It helps you do tons of work. It causes harm to your health, even kills you; and it is very effective at that.