Professor Thomson said doctors who treat asthmatics should consider prescribing them other drugs if they smoke.
They say that asthmatics should considering limiting the quantity of melatonin supplements they take.
They called for warnings to be added to packaging for painkillers to warn asthmatics of the dangers.
He runs outdoor camps for asthmatics and a rainwater-conservation project in the state of Rajasthan, along the western border.
Bronchial inflammation generates free radicals, and there is evidence that the antioxidant levels in the respiratory tract lining of asthmatics are reduced.
Asthmatics, diabetics and even AIDS patients have been shown to arbitrarily reduce the dose or frequency of their therapy, or skip it altogether.
Researchers from the National Jewish Medical and Research Center in Denver, US, found that the hormone caused a drop in lung function in asthmatics.
The researchers found the types of cancers for which asthmatics had an increased risk were those commonly found in smokers (such as squamous-cell carcinomas).
The researchers said the growing trend for patients to buy over-the-counter painkillers meant it was important to raise awareness of the potential risks for asthmatics.
Dr John Costello, clinical director of medicine at King's College Hospital in London, told BBC News Online warnings on aspirin and NSAID packets would help asthmatics.
Implantable or attachable devices already exist or soon will exist that can monitor the conditions of diabetics, asthmatics, heart patients and patients with numerous other chronic conditions.
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About 60% of the 17 million U.S. asthma sufferers are allergic asthmatics, meaning that their asthma attacks can be triggered by allergic reactions to pollen, dust or other normally harmless substances.
"People with lung disease, particularly asthmatics should keep an eye on ozone forecasts on Ceefax and in the papers so they can double their inhalers if the levels are likely to be high, " he said.
In tests on seven people with nocturnal asthma, 13 non-nocturnal asthmatics and 11 non-asthmatics, lung function tests revealed that patients with nocturnal asthma had the highest levels of melatonin and the greatest drop in lung function overnight.
Genentech and Novartis initially plan to aim Xolair at 500, 000 or so moderate-to-severe asthmatics whose condition isn't controlled even with high doses of existing drugs, such as GlaxoSmithKline 's (nyse: GSK - news - people ) inhaled steroid Flovent or Merck 's (nyse: MRK - news - people ) Singulair, a so-called leukotriene inhibitor.
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