That may not prove to be a fruitful whisper campaign for Hillary if these CDC numbers are right (from a survey released in June):

A history of drug use was most common among middle-aged adults.
More than 19 percent of those aged 20 to 29 said they had tried cocaine, crack or another street drug, excluding marijuana. This rose to 27 percent for people aged 30 to 39 and nearly 26 percent for those in their 40s.
But just 9.6 percent of those aged 50 to 59 acknowledged having ever tried street drugs.
“That number might be different if we had included marijuana,” Porter said.
“When you look at the overall prevalence of adults ever having used one (street drug), it is still over 20 percent. That is a lot more than I would have thought.”