Researchers in the UK have discovered that suppressing smoker’s thoughts about cigarettes when trying to quit can lead to behavioral rebound in the long run.

Smokers trying to give up – don’t stop thinking about cigarettes

Blocking thoughts of cigarettes helps reduce smokers’ intake at first, but means they smoke more than usual when they stop suppressing, according to new research published in Psychological Science, a journal of the Association for Psychological Science.

The study was carried out by researchers at St. George’s, University of London and the University of Hertfordshire.

Co-author Dr. James Erskine, a psychologist at St. George’s, says the study shows that many smokers attempting to give upas well as people trying to quit other vicesmay be thwarted by the very technique they use to stop.

Erskine said: “These findings have obvious implications for individuals seeking to give up certain behaviors, for example, smoking, overeating, drinking, sex and other excessive behaviors.

“If trying to avoid thoughts of something in an attempt to give it up actually unwittingly triggers a subsequent increase, it’s a poor method of achieving self control. This work may stop people using quitting techniques that are ultimately harmful.”

Erskine and his team set out to test whether smokers experienced behavioral rebound the phenomenon where trying not to think about something leads to an increase in the behavior. Their previous research into eating behavior and thought suppression showed that people trying not to think about chocolate subsequently ate much more than people who were deliberately thinking about it. However, previous studies only examined behavioral rebound over a period of five minutes, rather than days and weeks.

Eighty-five smokers, who smoked at least ten cigarettes a day, took part in the latest study. They were split into three groups and asked to monitor their cigarette intake over three weeks. All three groups were asked to behave as usual in the first and third weeks. But in the second week one group of 30 people was told to suppress their thoughts of smoking, and one group of 29 people was told to actively express thoughts about smoking. A control group of 26 was told not to change anything.

The first week’s results showed that each group smoked a different average number of cigarettes, so the researchers applied a formula to the following weeks’ results to ensure they were comparing like for like.

The results showed that neither the expression group nor the control group differed significantly in the number of cigarettes smoked from week to week. However, in the second week the suppression group smoked, on average, nearly five less cigarettes each than the expression group and almost four less than the control group. And in the third week when they stopped suppressing their thoughts the suppression group smoked nearly three more than the expression group and the control group. From the raw results, the suppressions group’s increase from week two to three was six cigarettes per person, roughly three more each than smoked in the first week.

Erskine said: “This shows a clear behavioral rebound. The fact that the suppression group smoked less in the second week shows that this method may be effective in reducing unwanted behavior in the short term. But this actually isn’t helpful, as smokers might then think that thought suppression is a useful strategy in quitting smoking.

“In this case, we asked the suppression group to stop suppressing in week three, but the rebound effect should be the same whether it is deliberate, or whether other real life factors cause someone to stop suppressing thoughts of smoking. In real life, it can be hard to continue suppressing your thoughts.

“Although the differences in the number of cigarettes smoked from week to week may seem small, we know that habitual smokers are remarkably consistent in how many they smoke. So, even a small difference can be considered significant.

“Knowing what techniques not to use should lead to better understanding of what methods of quitting do work.”

For more information about this study, please contact James Erskine at

The APS journal Psychological Science is the highest ranked empirical journal in psychology. For a copy of the article “I Suppress, Therefore I Smoke: Effects of Thought Suppression on Smoking Behavior” and access to other Psychological Science research findings, please contact Keri Chiodo at 202-293-9300 or

Contact: Keri Chiodo
Source: Association for Psychological Science

Cigarette smokers behavioral rebound
Smokers who suppres thoughts of smoking more likely to encounter behavioral rebound. Image: Ian Britton, Freefoto