Some foods are more seaonally appropriate than others. First of all, despite occasional claims to the contrary, you don't consider some drugs to be drugs at all. Many of you champion the notion of a drug-free America while sipping your beers and smoking your cigarettes. It intoxicates, and if you drink enough of it, you stop breathing and die. It is a drug.
Tobacco is addictive and produces marked physical and mental effects.
It is a drug. Second, and most important, the drugs you have made illegal are a wide-ranging assortment indeed. I, as a mere lizard, wouldn't be decadent enough to know by name. Of course, federal and state statutes place drugs into several schedules, or classes of danger, but the fact that you've got marijuana listed with heroin proves that if drugs do indeed cause brain damage, you've chosen wisely not to indulge yourselves because you don't have that much to lose upstairs.