I've heard from many sources that some types of underarm deoderant can contribute to breast cancer. I use an all natural style because I figure it works just as well and is probably better for me in many ways. But is that true?

I've read that anti-perspirents are the culprit. If you only use a deodorant you should be okay.
When you think about it, you really shouldn't use something that won't allow you to sweat. It's not natural and surely can't be healthy.