What word is missing from the following medical fact from the 19th century? ______ was originally marketed as a cough suppressant in 1898 as it was not believed to be addictive. This was quickly realized not to be true as it readily breaks down into morphine in the body. Morphine was already known to be addictive.

Considering all the tissues and cells in your body, 25 million new cells are being produced each second.