Is smoking or garden chemicals or radiation from the sun and diet high in fat are some causes of cancer?

Answer 1

No, not really. None of those things directly cause Cancer, all they do is contribute to our bodies cells and DNA being more likely to mutate over a long time of cumulative exposure that may result in you eventually developing Cancer because of changes to your DNA. It is a ''link'' not a cause. Remember Cancer is very complex series of genetic mutations that is usually totally random and ''no ones fault'' and can occur at any stage of life, although rare in the young, it can still happen for reasons unknown. But fortunately most young people in general have a tumor suppressor gene that works in keeping your DNA in line even when it does mutate every now and then, so it doesn't spiral out of control and form tumors. But as we age, we gradully lose this ability and we become more vulnerable to developing Cancer as the years go on.

But for the most part Cancer has no cause just contributors