Smoking increases the risk of SUICIDE: Nicotine in cigarettes may 'trigger or exacerbate mental health problems'
- Previous research has shown a link between suicide and smoking
- Was thought because people suffering psychiatric disorders tend to smoke
- But new study suggests chemicals in cigarettes are to blame
- Found U.S. states with stricter anti-smoking policies had lower suicide rates
- In states with more lax laws, suicide rates increased
Smokers are
more likely to commit suicide than those who never take up the habit -
and the chemicals in cigarettes may be to blame.
Previous
research has indicated that smokers are more likely to take their own
lives - but it was thought this was because people with psychiatric
disorders also tend to smoke.
Now new research suggests the nicotine in tobacco
could trigger psychiatric disorders - or make
them more severe.
The study compared U.S. states that have increased tobacco taxes and banned
smoking in public to those that have not.
Suicide rates in the U.S. declined in states
that enforced higher taxes on cigarettes and stricter policies to limit
smoking in public places - and increased in those that were more
lenient. Map shows the range of state cigarette taxes from the lowest
(lightest blue) to the highest (darkest blue)
Suicide rates were
lower in states that were 'anti-tobacco', the researchers from Washington University, St. Louis, discovered.
Those
that had increased tobacco taxes
and banned smoking in public places between 1990 and 2004 had saw
suicide rates decline by up to 15 per cent compared to the national
average.
Since, then states such as New York, Illinois and California have enforced smoking bans in public places.
The conclusions were drawn after analsying the different smoking policies adopted by different states, such as approaches
to taxing cigarettes and limiting when and where people could smoke.
Using
statistical methods, the researchers compared rates of suicide in
states with stricter tobacco policies to rates in states with more
lenient laws and lower taxes.
They say their findings show more policies to limit smoking should be introduced for mental health reasons as well as physical.
Richard Grucza, assistant professor of psychiatry at the university, said: 'Although scientists
have known for years that people who smoke have a higher risk for
suicide, they had assumed the risk was related to the psychiatric
disorders that affect many smokers.
'These new findings, however,
suggest smoking may increase the risk for psychiatric disorders, or make
them more severe, which, in turn, can influence suicide risk.
One theory is that the nicotine in tobacco could trigger psychiatric disorders - or make them more severe
'We
really need to look more closely at the effects of smoking and nicotine,
not only on physical health but on mental health, too.
'We don't
know exactly how smoking influences suicide risk. It could be that it
affects depression or increases addiction to other substances. The numbers show it clearly does something.'
Nicotine is likely to be the key culprit, he added.
'Like
any other addicting drug, people start using nicotine to feel good, but
eventually they need it to feel normal. And as with other drugs, that
chronic use can contribute to depression or anxiety, and that could help
to explain the link to suicide.
'If you're not a smoker, or not likely ever to become a
smoker, then your suicide risk shouldn't be influenced by tobacco
policies.
'So the fact that we saw this influence among people who
likely were smokers supports the idea that
smoking itself is linked to suicide - rather than some other factor
related to policy.
The research was published in the journal Nicotine & Tobacco Research.
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