Is drinking quite a bit of tab or coke light everyday bad for you ?!
Not everyone is the same.
It can stain your teeth, give you heartburn and I suppose eventually something else could go wrong. Thats a lot of weird chemicals in stuff like that.
Yes, it is very unhealthy for you. Coke and soft drinks in general erodes your stomach lining because of the acidity in them. They also contain quite a bit of calories (120 calories per can).