From the same Reuters story quoted below, an interesting bit from Sir Mick Jagger:

“When we were experimenting with drugs, little was known about the effects,” Jagger said. “In our time there were no rehab centres like today. Anyway, I did not know about them.”

Sounding a bit like the 64-year-old grandfather that he is, the fitness fanatic said he couldn’t understand how the younger generation, knowing the dangers of drug use, could still be users.