Lapsang souchong tea contains between 50 to 100 milligrams of caffeine per brewed cup. It also comes in a decaffeinated version, which contains 2 to 4 milligrams of caffeine. The caffeine level varies depending on the steeping time and water temperature.
Hotter water and a longer steeping time produce a more caffeinated cup of tea. Caffeine levels also increase as the ratio of tea to water is increased or if the tea leaves are broken into small pieces. Lapsang souchong tea is black tea, which has the highest caffeine levels. Green tea contains less caffeine, followed by white tea. Herbal tea is naturally decaffeinated.