is 20 cigarettes a day a heavy smoker How many do you guys smoke day? What do you consider smoker? And do you enjoy smoking or smoke out of habit? : r/Cigarettes Delhi Pollution: What Is Truth

The film is certainly never (just) a drag, as it's fascinating to observe how individual personalities emerge from the everyday, innocuous act of smoking a cigarette, the way some smokers linger over each inhalation (a couple of shots run more than seven minutes apiece), whereas others engage in staccato, businesslike puffs (two smokers manage to break the three-minute barrier)

Even with filters, many of the toxic chemicals in cigarettes still get into the lungs, accumulating in the alveoli where they can deteriorate lung tissue

They may appear blotchy, purple, dark brown, or black

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Annals of Internal Medicine, 170 (1), 7679