i always say a prayer for anyone who is going through this same thing. it is torture for cough in front of people and see them back away and think i am going to give them something. then watch some young person light up a cigarette and laugh at me because i caution them! will anyone learn and listen to some wisdom?? 40 yrs. and finally saw the light but too late for me. hope you continue to do well and bless your son and keep him safe from harm and to come home safely.