Can you be addicted to refined sugar?

Is there a such thing as a refind sugar addicition? I rarely ever eat it, but when I do, I can't stop. I would go as far to say that I eat zero refined sugar... except for M&Ms. I don't even eat M&Ms too often, I only eat them when I get tired at work which isn't too often. My problem is, I tell myself that a handful of M&Ms isn't so bad for me once in a while, and that it will wake me up. But... then I have 2 handfuls, then 3, and then 4, and before I know it, I eat literally like 100 M&Ms. I actually have a jar sitting on my desk and I refrain from even touching it most days. But those few days I tell myself I am only going to have a handful.... I just never stop eating them. What's the deal?