<unk> s, also known as<unk><unk>  drugs (PEDs), are substances that are used to improve any form of activity<unk>  in humans. A well-known example involves doping in sport, where banned physical<unk><unk>  drugs are used by athletes and bodybuilders. Athletic<unk> s are sometimes referred to as ergogenic aids. Cognitive<unk><unk>  drugs, commonly called nootropics, are sometimes used by students to improve academic<unk> .<unk> s are also used by military personnel to enhance combat<unk> . The use of<unk><unk>  drugs spans the categories of legitimate use and substance abuse.
Performance-enhancing substance
Appetite stimulant
Heroic medicine
Stimulant
Psychoactive drug
Endocannabinoid enhancer
Natural neuroactive substance
Synthetic cannabinoids