I always knew smoking has something to do with the control of my depression, this gonna be controversial, but since I started to smoke (at 16) my life changed, I didn't have that horrible feeling of sorrow and sadness anymore and all my suicidal thoughts was gone, I truly think smoking saved my life, now I know why:
Translated version of http://www.jornada.unam.mx/2008/08/19/index.php?section=ciencias&article=a02n1cie
Translated version of http://www.jornada.unam.mx/2008/08/19/index.php?section=ciencias&article=a02n1cie