求一篇600-800字的英文文章是关于肺癌和吸烟的关系的!!!

Is there a cause-and-effect connection between smoking cigarettes and lung cancer? One might well think so. We know that burning plant products produces smoke, which contains carcinogens, and other unpleasant compounds. We know that breathing smoke gets these materials deep into our lungs - which is why, in part, inhaling drugs can be an important option for drug delivery. We know that breathing smoke regularly, as in cigarette and other tobacco smoking, leads to increased rates of lung cancer, in a dose dependent manner.
Smoking led to increased tar delivery, more cellular changes in sputum, damage to alveolar macrophages, and increased abnormality in bronchial biopsies, with increased surrogate markers for lung cancer.
Around 90% of lung cancer cases are caused by tobacco smoking and a new study shows that tobacco smoke -- including secondhand smoke -- may also contribute to non-lung cancers more than previously thought.
The fact that lung and non-lung cance