Tobacco smoke is the number one risk factor for lung cancer – and every time it is inhaled, it deals a double blow to lung cells, creating conditions almost ideally suited to the formation of cancer.

众所周知，吸烟是导致肺癌的首要风险因素。 每次吸烟时，都会对肺细胞造成双重打击，为癌症的形成创造理想的生存环境。

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And University of Washington researchers are testing a way to measure lung function in people with asthma or emphysema as they blow onto the phone and it captures the sound.

NPR: Physical By Smartphone Becoming Real Possibility