Put it simply a weed is just a plant in the wrong place. Or man has no more use for, it gets in his fingers, gets in his toes, and his clothers. Don't forget "ragweed," came in with imported grain from USA. Spread very quickly with 4x4's and don't forget the harvesters also, until they realized, hey! we are the culprits. Still, I don't like your poisons, blame the tobacco in pouch, if you must, it is just another indian weed, used as an insect spray, can be just as effective as more potent stuff. Home gardeners can chip out the weed, and recycle it, mulches the soil, and garden needs less water, retains moisture. Helps with your arguement in another issue in forum.