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The research, which reopens the debate on the dangers and benefits of e-cigarettes, suggests the vapour produced by the devices can compromise the immune system in the lungs, leaving them more vulnerable to infection by harmful bacteria and viruses

Adherence to medications is important and this can be monitored along with mood and experiences to enhance discussion of how smoking cessation medication helps to alleviate withdrawal

Dr Ludmil Alexandrov, first author from Los Alamos National Laboratory, said: Before now, we had a large body of epidemiological evidence linking smoking with cancer, but now we can actually observe and quantify the molecular changes in the DNA due to cigarette smoking

Adherence to the guidelines on Tobacco-Free Educational Institutions can improve the implementation of COTPA in and around educational institutions