Positive ions are present in cigarette smoke.
These changes are similar to those described in advanced cases of human bronchitis. I was going to take the evening off from document posting, but when I turned on the TV to relax I saw a deeply touching TV commerical that showed an older black woman, alone in her apartment in the bitter cold winter of Minneapolis, gently and enthusiastically peeling a ripe tangerine as though it was a rare gem. The wording of the commerical expressed her profound gratitude that the food bank was able to supply her with this rare and delicious treat. It was an ad for Philip Morris.