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All the major respiratory diseases are caused by tobacco smoking and exposure to second-hand smoke, but the leading causes of death and disability are lung cancer, chronic obstructive pulmonary disease, tuberculosis and asthma

The data (Figure 9A and 9B) demonstrated that the distribution of plasma nicotine and cotinine in plasma of controls and smokeless tobacco consumers

NCBI Sequence Read Archive , (2013)

Nicotine can also increase stress levels and contribute negatively to teens mental health

In August, Altria Group, the largest cigarette maker in the US, will start selling its MarkTen electronic cigarettes in the state of Indiana