Do you ever justify bad behavior because you have cancer?

Today I went to Vic's Ice Cream and got a mint chocolate chip and coffee milkshake and it was fantastic.

As I drank I kept thinking, "Man, this stuff can really fatten a person up. I am getting married in five months and I should be watching what I eat."

And then I shrugged my shoulders and thought, "But I have brain cancer and who knows how long I will live?"

Does anyone else ever rationalize actions this way?