Well... i would be lying if i said that weed didnt lessened my interest in things. But my uninterest is rather a phylosophical one... after i started to smoke i started to think FAR more than i used to do (and thats saying something, as i always was a great thinker), and i realized the uselessness of everything. As many religions (eastern mainly) states something similar, about the illusional character of the things, i wouldnt say thats a bad influence of the weed, but just a realization brought by it.