Smoking has warped my brain. One evening last winter,mk as I stood outside a pub, cigarette in hand, a friend who works in life insurance decided to calculate the chance of me dying before I hit 60 if I carried on smoking. He quizzed me about my lifestyle, plugging the answers into his death matrix. “If you give up smoking now, there’s a 6% chance you die before hitting 60. If you don’t, it’s 13%,” he concluded. Normal people will see that the chance of early death has doubled. But smokers don’t think normally. Just 13%?I thought.I could work with those odds …