The loss of concentration that smokers suffer when they try to stop smoking is not, in fact, due to the physical withdrawal from nicotine. When you are a smoker and you have a mental block, what do you do? That’s right, if you are not already smoking one, you light a cigarette. That doesn’t cure the block, so then what do you do? You do what non-smokers do: you knuckle down and get on with it. Only this time you do so without the distraction of going through nicotine withdrawal.

