50 cigarettes a day Researchers at Johns Hopkins University found that even 2–5 raise the risk of cardiovascular disease by almost 50%. Cutting down doesn't help — even “light” or occasional smoking still Delhi pollution 'like smoking 50
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![Cigarette smoking is associated with levels of the serotonin transporter in the brain: a [11C]DASB PET Study](https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c13d/12095803/f9a0c4682e55/pyaf026_fig1.jpg)







