I myself am guilty of using my mobile phone while driving. I haven't actually written or sent a sms while driving, but I have used my phone to read text messages and answer calls. I've also used my ipod while driving which is more or less the same thing. Reading a text message on your phone while driving is a lot easier than sending a sms, but still dangerous. I know that, but I do it anyway haha. Whenever I do use my phone to read a sms, I usually do it when I am stopped at a red light, otherwise while I'm driving I always hold it up high enough so that I can see the road and phone at the same time and I only do it when I'm driving down a straight road. I'm not going to try to use my phone if I have to turn at an intersection haha.
I've also eaten food and drink while driving, but I don't think that is that dangerous, especially in an automatic where you don't have to change gears because I can use one hand for holding the food or drink while I control the steering wheel with my other hand. Driving with one hand on the steering wheel is quite easy actually if you know how to do it.
I've also used my radio while driving as well, that has been the most dangerous thing for me because I was looking at my radio for only a second and when I looked up I was on the other side of the road. Luckily I was in a suburban street, so there wasn't any other cars at the time, but that was my lesson learned haha. Now I always make sure that I am always watching the road if I am doing something while driving.