The Twinstitute - Season 1 Episode 5 -

In this episode, identical twins explore two regimes for quitting smoking. Chris and Xand meet Gareth and Mason, 23-year-olds from London. They are '10-a-day' smokers and have been for so long that their lungs actually resemble those of a 40-year-old. They need to quit!. Chris has arranged for Mason to spend a month undertaking an intensive course in Cognitive Behavioural Therapy. CBT is a technique pioneered in the 60s to help patients understand what is known as 'automatic thoughts'. In Mason's case - these thoughts fuel his desire to smoke. By enabling him to understand those thoughts, he and his therapist can build a mental tool kit that might allow him to change his behaviour and quit the nicotine.