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Secretory IgA doesnt directly kill microbes, but it prevents them from triggering a damaging immune response before they can be cleared by other mechanisms

Dr Chiara Herzog, first author of the study, said: 'While the scientific consensus is that e-cigarettes are safer than smoking tobacco, we cannot assume they are completely safe to use and it is important to explore their potential long-term risks and links to cancer

In some cases, we can directly supply you with the treatment before you leave, or we can arrange for you to receive a prescription or a voucher for it

Instead, they turned to nicotine replacement products like patches or gum