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.
The origins of opium consumption in China are very old, and its first real boom as an item of consumption began after tobacco was introduced from the New World in the 16th century and Chinese smokers took a fancy to mixing it with the drug.