I had posted this earlier as part of a PM... Needs to be here...
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...Of course, this is the time of year to look for a tiny PI leaf just unfolding. Appalachian folk medicine - Take a tiny PI leaf early in the year and swallow it whole. Don't chew it, one quick motion, sallow it down.
It makes you immune to PI until the next year. I know several people who do this every year, people I respect. If they say it works for them, it does.
Also... swallowing 2 or 3 dried poke berries are said to have the same effect. My uncle who does controlled burns, out in PI often, uses poke berries. He has no problem with PI now...
I use poke tincture often already, haven't had PI in ages. But the swallowing a leaf? I couldn't bring myself to try it. As a kid I've had PI so bad my eyes swelled shut, just can't get past it.