Splenda is an interesting subject. Chemically, its a sugar molecule with three chlorine atoms pasted on...yes, the highly poisonous gas. Well, the "point" of said add-ons was to make the molecule indigestible so it just passes through your system. However, it doesn't just pass through, a high percentage of that stuff is broken down...and then you have some dissociated chlorine floating around in your system <3
Aspartame....horrid tasting, but if you drink enough of it, you are quickly addicted (I know this because I was once an A-addict). Long term abuse can lead to memory loss because as your body breaks this stuff down, it metabolises it in the form of formaldehyde...yup, embalming fluid