Our public school system has an annual "Drug Week" on the effects of different drugs. It's the same every year and most of the kids seem to sleep through it.
This year we had a guest speaker from a nearby police department. He held the boys' attention for a full hour, yes, they even missed their game. His emphasis was on the effects of drugs on people's lives in terms of crime, jail time and physical damage. He really seemed to get to them.
Check local police departments, or school administrators. (That's how we got on to this guy.)