1.   Addictive behaviour is used just as addictive substances are used by people who are prone to addictive disease.

2.   Any player found guilty of using banned substances faces the prospect of a lengthy suspension.

3.   Sure, there are people using illegal substances in the Olympics, just as there are those among the general population.

4.   Two substances were used by ancient glass-workers to produce perfectly or near-perfectly colourless glasses.

5.   These substances are being used to help wean the world off its dependence on CFCs, which are damaging the ozone layer.

6.   The substance is used in the manufacture of cosmetics and drugs, among other things.

7.   Also, Giants players said that game was not the first one in which Dallas players had used the substance.

8.   And by using a substance similar to stomach lining, they can get an idea of whether a drug could be absorbed into the bloodstream.

9.   And in September, Pittsburgh Steelers offensive tackle Paul Wiggins was suspended for four games after admitting he used the substance.

10.   At the same time, he said, trees use a substance called glutathione both to form phytochelatins and to scavenge ozone molecules.