2.6. Venues
At least one visit to an outdoor smoking area was scheduled during a one-hour visit to a premise. An outdoor smoking area was defined as a place or premise, or part of a place or premise that is fully uncovered by any roof, fixed or mobile, or an outdoor place or premise that is covered by a roof, so long as not more than 50% of the perimeter (outside) is covered by a wall, windows, gate or similar.The study subjects were asked to spend at least 15 min in the outdoor smoking area, a preferable time of 30–60 min, and 15 min at rest was desirable.