What's ironic is that the product works much like a nicotine replacement for quitters.

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The survey was carried out for GlaxoSmithKline, which manufactures one form of nicotine replacement therapy.

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The government has also made the use of nicotine replacement a central part of its anti-smoking strategy.

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Until Chantix was approved, smokers had two drug options: nicotine replacement, including patches, gums and inhalers, and Zyban, a generic antidepressant developed by GlaxoSmithkline a decade ago.

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Dr Robert Anda, of the Centers for Disease Control and Prevention in Atlanta, said nicotine replacement therapy might not be sufficient to help people with long-standing emotional problems.

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And although the usual smoking cessation treatments such as nicotine replacement therapy are effective, people with mental health conditions may need higher doses or more intensive support, it said.

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She said as well as the shelters, the trust offers staff and patients the chance to take part in smoking cessation sessions, provides special councillors and free nicotine replacement therapy.

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