The discrepancy in findings may be attributed to variations in the definitions of smoking, types of tobacco used, levels of exposure, and the control of confounding variables
Sadness, loneliness, disruption of sleep, fatigue, digestion problems, stomach pains, poor memory, an inability to concentrate, a loss of appetite or weight gain, neglect of our appearance, low self esteem, loss of sex drive, irritability, hopelessness, headaches or even a change in bowel habits can and often do accompany depression
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These results also agree within uncertainty with effective densites of aged particles from tobacco smoke determined independently by Johnson et al