New research from the University of Toronto was not able to prove
that children of divorced parents turn to cigarettes as a coping
mechanism from lingering childhood trauma. But researchers did find that
people whose parents had divorced when they were children were at a
significantly increased risk of initiating smoking.
Of the 19,000 U.S adults included in the study, the odds of having smoked 100 or more cigarettes increased by 48 and 39 percent for sons and daughters of separated or divorced parents, respectively. The research suggests that experiencing a parents' divorce, in and of itself, is a risk factor for future smoking.
Source: The Atlantic