It was hoped he would meet heroin addicts and get a glimpse of the dangers of drugs.
Yes, of course. Marijuana is a gateway drug, and those who do it are likely to go on to harder drugs such as heroin. Also, masturbation causes blindness, and the hair of a seventh son cures warts. I'm sorry, but that has been debunked, and nobody other than William Bennett believes that anymore. Though, then again, we're talking about the Royal Family here...
(Then again, if you were in his shoes, wouldn't you be getting smashed regularly?)
Maybe we'll see a new serial book and movie about the misadventures of the younger royals: Harry Pothead, targeted at misanthropic younger readers disenfranchised by the Harry Potter series. Etc. Etc.