I am a heavy coffee drinker; I like the taste and thought I was getting some stimulant effect. But last fall and early winter I tested myself (described a litt

I am a heavy coffee drinker; I like the taste and thought I was getting some stimulant effect. But last fall and early winter I tested myself (described a little more here - http://williambswift.blogspot.com/2010/01/drugs-and-their-non-effects.html http://williambswift.blogspot.com/2010/01/drugs-and-their-no...) varying my dosage of caffeine, but keeping it steady at each dosage for a week at a time. And discovered I could find no evidence of any effect at all on me.