3 links
How Many Teeth Are In That Cigarette Pack
agd.org
The Academy of General Dentistry provides information on how tobacco products cause loss of teeth.
Oral Effects of Tobacco
maxillofacialcenter.com
Effects on oral mucosa, gingival and bone damage, damage to teeth local physiology, microbiology, esthetics.
Tobacco and Dental Problems
globalink.org
32 page factsheet from a book on tobacco covers what tobacco products do to teeth and gums.