But after just two weeks of daily game therapy, he stopped taking Ritalin, a prescription amphetamine.

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Data on people arrested in Sweden show many who admitted to taking amphetamine actually tested positive for meth.

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Animal studies have shown brain abnormalities persisting four years after amphetamine use stops.

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Groups such as the Institute for the Study of Drug Dependence say that amphetamine use is actually falling, despite its association with the club scene.

BBC: Amphetamine brain damage measured

Defence advocate Frank Gallagher said a medical report explained the start of Boag's amphetamine habit after his involvement in the Gulf War in the early 1990s.

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Dr Adrian Williams, director of Sleep Disorder Centre at of Lane-Fox Unit, St Thomas's Hospital London said the new study is significant and could provide a better alternative to current treatments, which are mostly amphetamine based.

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Even today, according to a 2005 USA Today report, 87.2 percent of the players surveyed said amphetamine use is rampant in baseball and 35.3 percent said as many as 50 percent of all players are using.

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When Danish cyclist Knud Enemark Jensen died at the 1960 Olympics in Rome, his autopsy revealed traces of amphetamine, and the following outcry led to drug testing being adopted by the world cycling and football federations -- as well as the International Olympic Committee in time for Mexico '68.

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Rusk, 67, a former machinist and painter who admitted on a 1992 medical exam to drinking a six-pack of beer a day and occasionally using "amphetamine and IV crank, " blamed his shortness of breath on brake pads even though he worked part-time as a car mechanic and started smoking in 1951.

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