A new study has found that an overwhelming amount of sunscreens on the market contain an ingredient that speeds cancerous cell growth. That’s right: sunscreen might cause cancer, the very thing people lather it on to protect themselves from. ┬áThese results come from the EWG Sunscreen Guide 2010. It is kind of scary to think that what we use to “protect” us from the harmful uv rays of the sun is actually causing and speeding …