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Medical Question about Passive Smoking

  1. Aug 16, 2017 #1
    Hello Friends!
    Smoker inhales Carbon monoxide and it is thousand times more reactive than Oxygen due to its triple bond formation with haemoglobin which is a protein molecule having iron at centre.
    Normally in inhaling of oxygen haemoglobin becomes oxyhomoglobin(single bond) and carries fresh oxygen to cells where oxygen is detached and Haemoglobin comes back to take fresh oxygen again.
    When one smokes haemoglobin makes carboxy haemoglobin ( triple bond) .In this case carbon monoxide does not detach from haemoglobin.So consequently excess carboxyhomoglobin accumulates.
    Is some carbon monoxide left without getting attached to haemoglobin and hence more harmful to cells.

    In the exhaled gas of a smoker what is there to do more harm to passive smokers.

    Please refine the above sequence of logic.
    I am not clear about the process.
  2. jcsd
  3. Aug 16, 2017 #2


    Staff: Mentor

  4. Aug 16, 2017 #3
    Link does not provide enough information.
  5. Aug 16, 2017 #4
    Sorry jedishrfu! Link was not opening earlier.Now it is opening and seems to contain excellent information. Thanks!
  6. Aug 19, 2017 #5
    When normal oxygen is inhaled most of it is attached to haemoglobin and a reversible equilibrium is set up so that oxygen can be detached and given to cells of body.
    When cigarette smoke is inhaled by a smoker,carbon monoxide gets attached to haemoglobin and an irreversible equilibrium is set up.
    Adding the above argument now,how technically speaking passive smoking is harmful.

    Exhaled gas by smoker in comparison to gas inhaled by smoker himself.Which is more harmful and why?

    What exactly are the contents of exhaled gas .I think they are only unreacted carbon monoxide as oxyhomoglobin cannot come out as gas
  7. Aug 20, 2017 #6

    jim mcnamara

    User Avatar

    Staff: Mentor

    When a history is done on cardiology patients, parental smoking is considered as if the patient smoked from birth to age 18. Even if the patient never smoked at all. Why?


    So, please forget your carbon monoxide argument, it is not the primary issue. Smoking is actually a public health issue. Which is why many places in the US have banned smoking in public buildings and some kinds of businesses.
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