Keep in mind that saccharin was banned briefly by the FDA because it too produced tumors is susceptible lab animals. The ban was lifted almost immediately because it was the only sweetener that some people could use and they would not stand for being deprived of it.
I live in Southern California where it is hazardous to breathe the air. Not breathing, on the other hand, is quickly fatal.
Anything, taken to excess, can be bad for us. There are three different types of artificial sweeteners, you can simply pick the one you are most comfortable with or alternate to limit your usage of any one. As someone has already pointed out, you could simply drink water.