One may argue that the smoke could be added in post-processing but depending on time constraints and photographer's skill level in editing, it can be a lot easier to create it during the shoot
In particular, our results suggest that a trajectory of heavy smoking, starting in early adulthood (18 to 30 years), may contribute quite considerably to poor cognitive function by midlife (42 to 59 years), and also indicate that a trajectory of moderate smoking could lead to poor cognition by midlife
Cimolai, N.) 795821 (Marcel Dekker, New York, 2001)
Of course, the men would light up and go into one room while the women would depart for a separate space.
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