[NYAPRS Enews] Study: Smoking Could Increase Depression Risk

[Harvey Rosenthal]

Cigarette Smoking 'Could Increase Risk Of Depression'

Medical News Today   June 2, 2010   

New research published in the British Journal of Psychiatry suggests
smoking could increase the risk of depression. 

The <http://bjp.rcpsych.org/cgi/content/abstract/196/6/440>  study,
carried out by researchers from the University of Otago in New Zealand,
followed over 1,000 people. At the ages of 18, 21 and 25, the
participants were asked about their smoking habits and whether they had
symptoms of depression. 

The researchers found a strong association between smoking and
depression. People who were dependent on nicotine were more than twice
as likely to have symptoms of depression as those who were not nicotine
dependent. 

The researchers looked at this relationship in more detail using a
sophisticated statistical technique called structural equation modelling
(SEM). This analysis showed that smoking increases the risk of
developing depressive symptoms, rather than people being more likely to
smoke because they're depressed. 

Commenting on the results, lead researcher Professor David Fergusson
said: "Our findings are consistent with the conclusion that there is a
cause and effect relationship between smoking and depression, in which
cigarette smoking increases the risk of developing symptoms of
depression. 

"The reasons for this relationship are not clear. However, it's possible
that nicotine causes changes to neurotransmitter activity in the brain,
leading to an increased risk of depression." 

Professor Fergusson and colleagues do emphasise that their study does
not prove that smoking causes depression, and said that the study
"should be viewed as suggestive rather than definitive".

References
"Cigarette smoking and depression: tests of causal linkages using a
longitudinal birth cohort"
Boden JM, Fergusson DM and Horwood LJ (2010)
British Journal of Psychiatry, 196:440-446

Source: Royal College of Psychiatrists

http://www.medicalnewstoday.com/articles/190546.php 

 

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