Why is smoking cigarettes injurious to health?

  • A
    It increases the oxygen-carrying capacity of blood.
  • B
    It contains nicotine which stimulates the adrenal gland to release adrenaline and nor-adrenaline.
  • C
    It reduces the risk of lung cancer.
  • D
    It has no effect on heart rate.

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Similar Questions

Which one of the following options gives the correct match of a disease with its causative organism and mode of infection?

Identify the molecules $(A)$ and $(B)$ shown below and select the right option giving their source and use.
| Molecule | Source | Uses |
| :--- | :--- | :--- |

Match the diseases with their respective pathogens or treatments.
List-$I$List-$II$
$(a)$ Amoebiasis$(i)$ Treponema pallidum
$(b)$ Diphtheria$(ii)$ Use of sterile food
$(c)$ Cholera$(iii)$ $DT$ vaccine
$(d)$ Syphilis$(iv)$ Use of Oral Rehydration Therapy

The main reason why antibiotics could not solve all the problems of bacteria-mediated diseases is:

In the given diagram of the life cycle of Anopheles,what do the parts labeled '$A$' and '$B$' represent respectively?

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