Khat usage is ubiquitous in certain parts of Africa (e.g., Yemen and Somalia). It's not really in the same class as harder drugs though. I've seen some reports

Khat usage is ubiquitous in certain parts of Africa (e.g., Yemen and Somalia). It's not really in the same class as harder drugs though. I've seen some reports that people grind up and smoke anti-retroviral medication for HIV (http://news.bbc.co.uk/2/hi/7768059.stm http://news.bbc.co.uk/2/hi/7768059.stm), but I'm not sure how common that actually is.