Why doesn't caffeinated tea cause the same effect as coffee?!

It's not necessarily that there is less caffeine in tea than in coffee, although that is true in many cases.

The reason you get a "high" from drinking coffee is because the caffeine is absorbed through your nervous system. This causes you to become hyper, jittery, and eventually crash.

The caffeine in tea, however, is absorbed through your blood stream. This causes a much more natural, gentle stimulant. It keeps you awake and alert without the jitters or the crash.

Hope this helped! :-)

I work for a tea company.

The caffeine in tea is some kind different from the caffeine in coffee. That's why some people who can't drink coffee are fine with tea. Here is an article that talks about it in details, hope it helps.
http://www.amazing-chinese-food.com/gree…

Even though tea has caffeine, the levels are not nearly as strong. A cup of coffee has 80 mg of caffeine whereas a cup of black tea only has 40 mg and green tea with 20 mg

There is not nearly as much caffeine in a cup of tea as a cup of coffee