Is drinking coffee or tea against the fifth precept?

The fifth precept most directly guides us to abstain from alcohol. Coffee is a stimulant and probably so is tea. Drinking either beverage affects our mental calm and makes us behave in ways that we would not do so without having drunk it. In this sense, drinking coffee and tea is not that different from drinking alcohol. Does drinking coffee or tea is considered against the fifth precept? In Asia, many people, including monks, drink tea. Does this indicate that drinking tea is at least not against the fifth precept?