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  • Taking a rebreathing test raises the carbon monoxide level in your blood to just under 6%, says Lundby. You would go about your normal day with levels of about 0.5% just from exhausts and pollution, while a smoker’s is about 8%. For a normal adult, after a rebreathing test levels would be at 2% by the next morning and back to normal within the day, even quicker if you exercise during that time.

    I knew it! I’ve been banging on for years that taking up smoking would make you faster. It’s quite simple: smoking 20 a day blocks your lungs up a bit and the smoke has less oxygen in it which is a bit like altitude training. Think how efficient your lungs have to become after a few years of hard work from that! You simply stop smoking a couple of weeks before competition so you can cough it all back up and clear your lungs and, hey presto, super strong clear lungs! Look at all the old Tour winners, they all used to smoke.

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