Cigarettes constitutes of
tobacco,
nicotine,
tobacco dusts (SWEPT FROM THE FLOOR),
reclaimed cigarettes (that passed their prime),
expanded tobacco (tobacco expanded using carbon dioxide TO act as a filler)...

A Finished cigarette is ...
20% expanded tobacco stems reclaim
30% recon
50% tobacco ( treated with sugar to create a better taste of nicotine , to enhanced absorption into smoker's body)