If anyone of any reputable standing says something is a potential carcinogen at any level or percentage, why on earth would you continue using it at all? It's

If anyone of any reputable standing says something is a potential carcinogen at any level or percentage, why on earth would you continue using it at all? It's well documented aspartame is at worst "not good for you", so why allow it at all? Other than the Coke and Pepsi's that will cry murder and loss of jobs.