IIRC, a 12 ounce cuppa Joe has about 120 mg of caffeine. Unless, it's Starbucks, which I think I read one time, has >200 mg. I believe most teas have about 1/2 the amount of caffeine. Coke has started listing their caffeine content and my daily Diet Coke has 48 mg caffeine. (sometimes I drink 2) Distant memory also says that Diet/Mt. Dews have about 55 mg in a 12 ounce serving.
Why not Earl JAM teas?