If you have experienced a traumatic event you may be more likely to smoke.
That is according to a new study at the University of Arkansas.
Researchers looked at 100 smokers who had been through at least one traumatic event.
As a result, 37-percent met the criteria for post-traumatic stress disorder.
They say those who suffer from the most severe symptoms smoke to suppress their negative feelings.
Researchers say understanding the reasons why people smoke may help develop effective quitting programs.