search for: 9x7

...uot;, "smoker: Yes", "sex: Female", "sex: Male". What command can I use to reduce the font size of these labels? In lattice terminology, cex is used to scale these strip labels. But I couldn't find the equivalent in ggplot. The reason I'm asking is I have a 9x7 array of plots which I've been plotting with lattice. I wanted to use ggplot because I like having the labels on the edge of the plots, but the label font size is too large and exceeding the size of the label box. Thanks in advance... -Sam