Aspartame is one of the most widely used artificial sweeteners in the world. It has been around since the 80s. So there's 40 odd years of pumping drinks and foodstuffs full of it. But, there's extremely limited evidence yet to suggest it is carcinogenic. My feelings at this point are, it has been widely tested, and massively used for decades, we would know by now if it definitely caused cancer. I am not saying it is good for you, but the cancer scares in my opinion are overstated at this point. But I am happy to be proven otherwise.