Is "drug" use an appropriate subject matter in a kids comic book?

In some of the cartoons I have seen, they showed characters using and abusing drugs and conveyed the message to kids that drugs are harmful, as part of anti-drug campaigns. My question is, is showing characters buying and selling and dealing with drugs bad, in a kid's comic? I'm writing a funny animal comic- They aren't using drugs but what could be construed as animal equivalents of drugs- catnip for cats, anise for dogs and a certain kind of mint for rabbits (I'm not certain what the rabbit equivalent of catnip is). I'm not going to show characters injecting it or snorting it- maybe ingesting the aroma of them, and characters smuggling them. Would that be bad? You have to be careful what you are doing for kids.