My son was weed eating at his uncles old shop today and I was weed eating.. When after a bit my eyes started burning. I wiped them off thinking it was just sweat. But then I noticed they still burned and so did my nose. I turned off the weed eater about the same time he shut off the lawnmower. He was having same burning, but a lil worse. There were so many dif weeds and stuff growing we have no clue what caused it. His uncle had the burning as well from inside the garage. He told us last yr he had a similar problem at a dif shop with the weeds and had someone tell him what plant was causing it. And thatwhen being cut up it releases fumes that cause these symptoms. He couldn't remember the name and I would really like to try and figure it out.