I used to not get poison oak, bad, until my mid-twenties. Now I get it so bad, I get it somewhat systemically (read: my lymphatic system is kind enough to spread it for me to the "warmer" parts of my body)
I currently have a student who has it pretty badly.
My lips started itching a couple of days ago.
I think I contracted it from grading his homework.
moral: homework can be bad for you!