Do you peel potatoes?

I've been reading about solanine which is a toxin found in the nightshade family of plants which includes all types of potatoes farmed for human consumption.

If I buy unwashed spuds I always wash and peel them, but if I buy washed ones generally I don't peel them and leave the skin on when chopping them up to make mashed potato. I'm very careful to ensure any that look green, or a decayed for any reason, don't get used.

How do I make mashed potato you ask? Well boiled potato, with some margarine and cracked black pepper mixed through during the 'mashing' phase.

So do you peel potatoes?