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Psychoactive drug restrictions and prohibitions have typically followed a reactionary pattern. From tobacco to LSD, the introduction of novel drugs has prompted therapeutic experimentation. Officials showed little concern until these substances also became popular recreational intoxicants.

The quest for saltpeter, the ‘inestimable treasure’ of Tudor and Stuart monarchs, crucial for the production of gunpowder, is the subject of David Cressy’s work, which spans the reign of the first Tudor, Henry VII, to the industrialised warfare of the 20th century.