[sethammons]

A guy in my village, a few years before I was alive, was immune to poison oak (as am I; not sure how common it is) and he would show off by eating a bit of it. After several years of this parlor trick, he had a severe reaction one time and went to the hospital. Throat nearly swelled shut.

This guy should be aware of said story.

[im3w1l]

Makes you wonder what went differently that one time. Does the body say produce immune cells with some level of natural variation and that one time it happened to produce ones sensitive to the substance?