Like a doctor once told me regarding the butter vs margerine thing... it applies to cooking spray crap as well...

Butter will make you fat... fat is easy to treat... Just get yer ass off the sofa once in a while... Margerine will give you cancer... cancer is not so easy to treat... cancer treatment involves poisoning your body and hoping that the cancer dies befor you do...

It's your choice, but we don't have magerine or cooking spray in our house anymore...