Caffiene, old school PED

Was pointed to a NY Times article today about the effects of caffiene and performance:

Caffeine, it turns out, actually works. And it is legal, one of the few performance enhancers that is not banned by the World Anti-Doping Agency.

So even as sports stars from baseball players to cyclists to sprinters are pilloried for using performance enhancing drugs, one of the best studied performance enhancers is fine for them or anyone else to use. And it is right there in a cup of coffee or a can of soda.
[...]
Starting as long ago as 1978, researchers have been publishing caffeine studies. And in study after study, they concluded that caffeine actually does improve performance. In fact, some experts, like Dr. Mark Tarnopolsky of McMaster University in Canada, are just incredulous that anyone could even ask if caffeine has a performance effect.

“There is so much data on this that it’s unbelievable,” he said. “It’s just unequivocal that caffeine improves performance. It’s been shown in well-respected labs in multiple places around the world.”

Maybe that helps explain the "greenie"/coffee cocktails that were a staple in most lockerrooms for decades. "Leaded" vs. "Unleaded" as they were often referred to.