E for Ecstasy by Nicholas Saunders
Appendix 1: Reference Section

32 A researcher reports from the rave by Russell Newcombe, Druglink, January 1992

Many take 2 tablets, optimal dose for maximum psychoactive effect at usual strength; a substantial minority take between 3 and 10 while a few 'more sensitive or smaller people' only half. . .

Many claim that regular raving and/or use of Ecstasy has improved their general mental state and their relationships with others. . .

Reports on people who have tried E in other situations often indicate somewhat different experiences, including more unpleasant aftereffects. It could be that increases in oxygen, endorphins and other substances in the body caused by vigorous activity interact with MDMA to produce experiences different from when the body is relaxed.