This giant fucker causes massive blisters and shit- I accidentally leaned against one of these fuckers and ended up in the ER with both legs raging burning with blisters and pain. Took six months to get over the itch and pain.

If it touches you, you have to rinse off your skin with dawn soap right away, then stay out of the sun for a week at least. Or not... some people aren't that effected by it. But it's better safe than sorry, given the consequences.

How it got here? Some say it was spread by chinese seed sellers on Amazon: people think they're ordering flower seeds and end up with that.

Yes I hear it is all over canada as well and probably spread from there. Canadian environmental laws make it next to impossible to kill the plant with the available weed killers

Source: a Canadian guy from work who made a point to get bottles and bottles of US weed killer while traveling to the states.