Can someone give me a brief list of artificial sweeteners and their harmful effects?

Based from what I have learned from my some units of Biochemistry on College, artificial sweeteners like apartame are said to be genotoxic, meaning it destroys the genes(may cause mutation or improper DNA reading that may lead to complications such as cancer) because aspartame, when digested is still I think gas. I don't know, ask a biochemist, they know better. :) For diabetic person it is advised but for a normal person refined sugar is more advised.