To record multiple use data, repeat the data field as many times as necessary, viz: product1, product2 etc. In most instances, data on both product and frequency are needed. In such situations, repeat both fields as many times as necessary, viz: product1, frequency1, product2, frequency2 etc.

The recommended standard for collecting information about smoking the above tobacco products is the Standard Questions on the Use of Tobacco Among Adults (1998) - interviewer or self-administered versions.

Tobacco smoking is a known risk factor for cardiovascular disease and cancer. The type of tobacco product smoked by a person in conjunction with information about the frequency of smoking assists with establishing a profile of smoking behaviour at the individual or population level and with monitoring shifts from cigarette smoking to other types of tobacco products and vice versa.

It is recommended that in surveys of smoking, data on age, sex and other socio-demographic variables should be collected. It is also recommended that when smoking is investigated in relation to health, data on other risk factors including pregnancy status, physical activity, overweight and obesity, and alcohol consumption should be collected.