Soft drinks such as colas contain significant quantities of

1. Soft drinks, particularly colas, are known to contain several ingredients including carbonated water, sweeteners, flavorings, colorings, and acids. 2. Many colas also contain caffeine as a stimulant. 3. Nicotine is found in tobacco, tannin is found in tea and wine, and renin is an enzyme related to kidney function and cheese making. 4. Significant quantities of caffeine are characteristic of many popular cola drinks.