Why not all drugs are able to effect the brain?

Drugs impact the brain because it causes abnormal growth which eventually forms tiny, almost mircroscopic little short hairy gnomes inside the oppicatal canal of the coccxy. This gnomes are very irritable but can be removed surgically. The gnomes will play padie wac on your pariential lobe. If you listen close enough you can hear the awsome reggie beat their banging out. After awhile the beat will infect your nerves, which becomes a pounding. Take two of theze and youll be fine.