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Carbon monoxide levels of 200 ppm may result in a mild headache after 2 to 3 hours of exposure, and a more severe headache and nausea after 1 to 2 hours of exposures to 400 ppm of CO

It is even more difficult to avoid relapse - after days, weeks or even years - and the long-term results of many stop smoking programmes are disappointing

In addition to completing the customs declaration form, travelers may be required to present receipts or proof of purchase for duty-free items they are declaring

Probability and predictors of relapse to smoking: Results of the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC)