Orders of magnitude worse than poison ivy. Friends had it pop up in the bottom of a little fake well in their front yard, and called the muni. about it. The muni sent a horticultural hazmat team to get rid of it.

If you ever see it, give it a WIDE berth. The residual effects from a brush with this stuff can leave you feeling the toxin and bearing the scars for, quite literally, years.

Under NO circumstances try to burn it. I read of a woman who made a bonfire with some poison ivy she'd reaped, and the smoke so insulted her upper respiratory that she DIED. And hogweed is way, way worse.