> You can also eat small amounts of poison and become immune. What kinds of pois...

schneitj · on Nov 7, 2016

I heard snake venom is like that.

http://www.dailymail.co.uk/news/article-3410065/The-man-immu...

jacalata · on Nov 8, 2016

Apparently it works for poison ivy: http://www.straightdope.com/columns/read/2757/what-poisons-c...

binoct · on Nov 8, 2016

Iocane powder

Actually there are a few, though it's definitely not the rule - https://en.m.wikipedia.org/wiki/Mithridatism

ghurtado · on Nov 8, 2016

Interesting link.

"It is important to note that mithridatism is not effective against all types of poison, and, depending on the toxin, the practice can lead to the lethal accumulation of a poison in the body."

"There are only a few, if any, practical uses of mithridatism. "

I think that will be my takeaway.

In case you didn't know, it looks like Iocane Powder is an imaginary substance: https://en.wikipedia.org/wiki/List_of_fictional_toxins