The thought process was that it's hard for me to _know_ why drugs are bad other than what I've been told and other outside knowledge sources (anecdotes, wikipedia pages, etc). However, wasting time on videogames is something I do often, so I can draw from my own experience in what is "too much" and what the deleterious effects are. It's a much more valuable lesson, because I know exactly what my situation is instead of trying to place myself in a hypothetical.