i am not an advocate to justify smoking. however the two articles i mention here explains further the studies done on schiz and smoking plus why it occurs and the payoff. http://apt.rcpsych.org/content/6/5/327.full and http://www.schizophrenia.com/szresea...es/001061.html

i caretook my schiz. ex husband for a year. he became a chain smoker before the illness manifested itself-age 18. after dx he continued this behavior. while caretaking him i managed to quit his smoking tho i had to hide my cigs in the process. i would find him taking butts off the ground and pocketing them for future use. clean health issue there. it was a constant battle. this article includes the behavior of chain smoking before the illness manifested itself. i no longer caretake him and he is back to smoking.
david has copd from smoking. that is the reaon i wanted him to stop. but i was aware of the studies and knew i was fighting an uphill battle.