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Polydrug use can involve both illicit drugs and legal substances, such as alcohol and medications

With some drugs you risk harm each time you use them, but with tobacco there is little risk immediately apart from the chance of an unpleasant coughing fit

It is recommended that data users familiarise themselves with the changes in methodology between each census

So if the order of the nucleotides is changed, then the function of the gene could change, leading to a problem with the resulting protein

Effect on lungs - Children who breathe secondhand smoke are more likely to suffer from pneumonia, bronchitis, and other lung diseases

Cigarette smoking may also contribute to preterm delivery by affecting the uterine response to contractions due to altered OT levels