(a)[2]
Explain why nicotine counts as a drug.
(b)[4]
Describe the effect on the gas exchange system of these tobacco smoke components: carbon monoxide; tar.
(c(i))[4]
Use the data in Fig. 4.1 to compare the percentages of men and women who smoked cigarettes from 1950 to 1998.
(c(ii))[4]
Use the information from both graphs in Fig. 4.1 to discuss the relationship between smoking and lung cancer.
(d)[3]
Explain why it is advised that pregnant women do not smoke.