Just too much of it!

Right now I have two acquaintances struggling with cancer and a third one has lost their life to cancer.  My question is what causes so much of it?  I believe we have to do more to determine the cause.   We need to help prevent some of it, there is too much!  We know that cigarettes cause 1/3 of all cancers and I must say I know smoking is the major cause of some of my acquaintances cancer.   Genetics also plays a role, but what about the rest?  It is great to treat the problem, but we need to start to address the cause.  Hundreds of years of research into drugs and trying to find a cure, but let's start to ask the question how. How did I get this?