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In the final model, we included a spline on age, random slope on age by study and the bias covariate encoding exposure definition (that is, current, former and ever smokers), which was picked by the variable selection algorithm 28,29

The UV rays from the sun can also help to kill any bacteria that may be contributing to the smell

The process of cleaning tobacco smoke off walls can be challenging

It is part of a series of measures aimed at tackling the health effects of smoking, one of the UK's leading causes of preventable death, disability and ill health

Product advantages: This air purifier can quickly purify the air and reduce the damage caused by smoke and dust to the human body