really ? as a performance-enhancing drug ?
I read some time ago a very serious article speaking of the positive effects of nicotin (tobacco) in some sports' performances.
Not all banned drugs are classed as performance-enhancing. Recreational drugs that would do anything but enhance your performance are banned for health reasons.
Karsten Braasch used to light up cigarettes during change-overs until the tennis associations imposed a ban on doing this.