Magic Dick of the J Geils band met the Muddy Waters band in Cambridge, Massachusetts, where, trying to act cool, he took aside [piano player] Otis Spann and showed him a cube of hashish. Thanks, said Spann, and popped the entire cube in his mouth. A few days later, Magic Dick asked Spann how he had liked the drug. Spann said, "I didn't know where I was for a long time."
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The rest of the book is also worth a read, and it inspired me to tackle Deep Blues by Robert Palmer. Even after 30 years, it is still an excellent history of the blues. Get on it!