original_query: What was the impact of Fleetwood Mac's extensive use of cocaine on the album's production?
query: What was the impact of Fleetwood Mac's extensive use of cocaine on the production of the album Rumours?
answer: The extensive use of cocaine during the Rumours album's production led to sleepless nights and self-indulgence among the band and engineers.  It was described as a period of "excess at its most excessive," with sessions marked by late nights and partying.