i State the average number of cigarettes smoked per day by female smokers in 1982.

ii State a year in which male smokers smoked an average of 19 cigarettes per day.

iii State two conclusions that can be made from the data shown in Fig. 16.1.

(b) Tar is a toxic component of tobacco smoke.

       (i) State two effects of tar on the gas exchange system.

+State the names of two toxic components of tobacco smoke other than tar.

State the names of two toxic components of tobacco smoke other than tar.

Tobacco smoke damages health and can cause many different diseases.

The table shows the number of deaths, caused by smoking, for three different diseases.

Calculate the percentage of deaths that were caused by COPD.