"It calms me down"

This chapter is about the mechanism, because the whole book depends on it. I'll keep the chemistry short.

When you draw on a cigarette, nicotine crosses from your lungs into your blood and reaches your brain in ten to twenty seconds. That's faster than an injection into a vein. It's one reason the cigarette feels so responsive. You do a thing, and within the same breath you feel the result. Very few things in life answer you that quickly.

Then your body starts clearing it. The level of nicotine in your blood drops sharply over the first twenty minutes as it spreads into your tissues, and then more slowly, halving about every two hours. So an hour or so after a cigarette, a regular smoker's brain, which has adapted over the years to expect nicotine, starts to register that the level is falling.

What that feels like is well described. Researchers who study people after they stop list the confirmed symptoms of nicotine withdrawal as anger, anxiety, low mood, difficulty concentrating, impatience, trouble sleeping and restlessness. Read that list again with a stressful day in mind. It's almost a definition of feeling stressed. The need doesn't announce itself as a need for nicotine. It arrives looking like irritability, or tension, or not being able to settle, and you read it as your mood or as the day you're having.

A cigarette ends it within seconds. So many times a day, for years, you run the same small experiment. You feel tense, you smoke, the tension goes. Any reasonable person would conclude from that experience that cigarettes relieve tension. The conclusion is wrong only because of what the experiment leaves out, which is where the tension came from.

A British psychologist, Andy Parrott, set this out in a paper in 1999 with the blunt title "Does cigarette smoking cause stress?". He pulled together several lines of evidence. Adult smokers reported slightly higher stress levels than non-smokers, and that's the wrong way round if cigarettes are a calming drug. Teenagers who took up smoking reported rising stress as the habit became regular. People who stopped reported less stress afterwards. And when smokers tracked their moods through the day, the pattern was normal mood while smoking and worsening mood between cigarettes. His summary was that the relaxing effect of a cigarette only reflects the reversal of the tension and irritability that build up as nicotine runs down. Dependent smokers, he wrote, need nicotine to remain feeling normal.

The last sentence is the one I'd underline. The cigarette gets you to normal and no further. A non-smoker is already at normal and didn't have to go outside for it.

It's a bit like an extractor fan that's been running so long you've stopped hearing it. When it clicks off, the quiet feels like a small gift. A cigarette clicks the fan off for an hour. It's also what turns it back on.

Here's the objection I'd raise if I were you. You might say that you know what calm feels like, that you feel it when you smoke, and that no paper can overrule your own experience. I agree. Your experience is accurate as far as it goes, and the relief is real. What the experience can't tell you is whether you've been lifted above level or returned to it, because relief feels the same either way.

I should add two honest complications. The first is that not everyone accepted Parrott's argument in full. The journal printed replies that disputed parts of it, and the question of how much smoking itself raises stress over the long run isn't closed. The part that isn't in dispute is the short-term cycle, where falling nicotine produces tension and a cigarette removes it. That's standard pharmacology, and it's what the NHS tells smokers today. Its advice says that many smokers mistake withdrawal symptoms for everyday stress.

The second complication is that a smoking break contains other things that do calm you down. You walk away from whatever wound you up. You go outside. You breathe slowly and deeply, which you almost never do otherwise. You stand still for five minutes. All of that helps, and none of it needs a cigarette. Chapter 6 comes back to this.

So when you next feel a cigarette calm you, I'm not asking you to deny it. I'm asking you to be precise about it. Something was making you tense, and the cigarette removed it. The question from the last chapter applies. Ask whether it added something or gave something back.