ggplot2 (qplot) text size

I'm trying to learn qplot in ggplot2, and I'm having a difficult time adjusting text sizes. Well, difficult doesn't descibe it - I can't do it at all. The manual tells me I can use cex just like in plot, but it's not working...

 
 

Introduce your friends to R

http://blog.revolution-computing.com/2010/01/introduce-your-friends-to-r.html

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