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The Correlation between Trauma, Smoking, Alcoholism and Happiness
The Harvard Happiness Project has found that the self-reported levels of happiness of people who suffer from trauma aren't significantly lower than their pre-trauma levels after a year or so, but chronic smoking and alcoholism are strongly anti-correlated with happiness, and family members of people who are chronic smokers/alcohol users result in lower levels of happiness, especially if they don't smoke or consume alcohol.