1680 - 1682 CE
Coffee houses play a significant role in the London postal system

When the Penny Post is established, coffee houses are used for the collection and delivery of letters.

Source: Austin, G. A. et al. (1979). Perspectives on the history of psychoactive substance use. NIDA.

Drugs: Caffeine (coffee, tea, cola, etc.)
Regions: UK (England, Scotland, Wales, Northern Ireland)