Inside <smoking> is stated whether the owner of the UDDF file is a smoker or non-smoker. If he or she is a smoker, the degree of addiction to smoking is given. Allowed keywords are: 0 — non-smoker, 0-3 — zero to three cigarettes per day, 4-10 — four to ten cigarettes per day, 11-20 — eleven to twenty cigarettettes per day, 21-40 — 21 to 40 cigarettes per day, 40+ — more than forty cigarettes per day.
The absence of <smoking> does not mean that the owner of the UDDF file is a non-smoker. ;-)
<personal>
<personal>
(see also <personal>)
<!-- non-smoker -->
<smoking>0</smoking>
<!-- too much cigarettes per day... -->
<smoking>21-40</smoking>