| Field ID | Description | Relationship |
| 3436 | Age started smoking in current smokers | Field 3436 was collected from participants who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 3476 | Difficulty not smoking for 1 day | Current Field affects who was asked to answer Field 3476 |
| 3486 | Ever tried to stop smoking | Field 3486 was collected from participants who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 1269 | Exposure to tobacco smoke at home | Field 1269 was collected from all participants except those who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 1279 | Exposure to tobacco smoke outside home | Field 1279 was collected from all participants except those who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 3456 | Number of cigarettes currently smoke ... | Current Field affects who was asked to answer Field 3456 |
| 1249 | Past tobacco smoking | Field 1249 was collected from all participants except those who indicated they currently smoke on most or all days, as defined by their answers to Current Field |
| 5959 | Previously smoked cigarettes on most ... | Current Field affects who was asked to answer Field 5959 |
| 3506 | Smoking compared to 10 years previous | Field 3506 was collected from participants who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 20116 | Smoking status | Field 20116 is partially derived from Current Field |
| 1259 | Smoking/smokers in household | Field 1259 was collected from all participants except those who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 3466 | Time from waking to first cigarette | Current Field affects who was asked to answer Field 3466 |
| 3446 | Type of tobacco currently smoked | Field 3446 was collected from participants who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 3496 | Wants to stop smoking | Field 3496 was collected from participants who indicated they currently smoke tobacco on most or all days, as defined by their answers to Current Field |
| 6158 | Why reduced smoking | Current Field affects who was asked to answer Field 6158 |