If schools always have anti drug propaganda to stop kids from doing drugs, why aren't they doing the same with?

the excess consumption of sugars and processed foods? we should be more concerned with something that everyone is doing to them selves instead of what a 'few' kids are doing. the anti drug psa don't even make much of a difference. in school we were told that 'drugs' were bad, but taught that the chocolate milk that we drink everyday could be bad. aren't long term poisons just as much of a problem as acute ones?