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.
Christopher Columbus brought a few tobacco leaves and seeds with him back to Europe, but most Europeans didn't get their first taste of tobacco until the mid-16th century, when adventurers and diplomats like France's Jean Nicot -- for whom nicotine is named -- began to popularize its use.