Main definitions derived from the suggested items
| Domain | Definition |
|---|---|
| Ever smoker | Ever smoking or experimenting with waterpipe |
| Current smoker | Smoking waterpipe at least once in the past month |
| Daily smoker | Smoking waterpipe every day or on most days of the week |
| Weekly smoker | Smoking waterpipe at least once a week but not every day |
| Monthly smoker | Smoking waterpipe at least once a month but less than once a week |
| Former smoker | Smoking waterpipe in the past, but not currently (not in the past month) |
| Age of initiation | Age when first started smoking waterpipe |
| Waterpipe-years | Number of waterpipes smoked per month divided by 30 and multiplied by numbers of years of smoking |
| Cessation | Not smoking waterpipe for at least a month in an attempt to quit |