I've heard some rumblings around here and there. Should women really wear bras?

Here's a link to a tiny article I read on a "how to" but there are no links to anything on any real science.

I've heard that bras don't actually do any supporting of the breasts, just constraining, and can actually cause more harm than good (even cancer!). But I definitely need to get some research done before I make a choice to go braless. Especially since I'm a bigger girl, my girls are HUGE hah! If anyone has any insight on this, PLEASE share. And I'm not concerned about gender, so if you got real proof saying yay/nay/maybe, I'm all ears!