Why doesn't a cigarette catch fire?

Answer 1

Quote from the Related Link: "Most cigarette filters are made from cellulose acetate, which will burn, but won't ignite. Thus, most of the time it extinguishes itself when air is no longer moving around it."

Answer 2

For the same reason a damp matress won't ignite...there is a certain aount of moisture in every tobacco product which would prevent it from truly igniting in flame!

Answer 3

when you breathe in you add oxegen to it.