When to see a doctor. See a doctor if you or a loved one has memory problems or other dementia symptoms. Some treatable medical conditions can cause dementia symptoms, so it's important to determine the underlying cause.
A brief history of tobacco. (CNN) -- Tobacco was first used by the peoples of the pre-Columbian Americas. Native Americans apparently cultivated the plant and smoked it in pipes for medicinal and ceremonial purposes.
TOBACCO TIMELINE. 1  Prehistory: In 2010, tobacco was found that dates to the Pleistocene Era 2.5 million years ago. 2  Paleontologists from the Meyer-Honninger Paleontology Museum discovered the small block of fossilised tobacco in the Maranon river basin in northeastern Peru.