Some things they don't tell you till it's too late. Like, as you are sliding off the padded chair, clutching your wrist under your chin, delighted with yourself for giving blood and indescribably proud of the two inch plaster adorning the inside of your elbow, the nurse calls out: 'Now, no alcohol for 24 hours. And no smoking for two hours.'
Ahem? I didn't sign up for this.