Sure, but the folks in HK might enjoy that particular mix, right? I'm just trying to say that mixing in tea with your coffee isn't pointless or run counter to this particular study.
Coffee has other side-effects. If you are trying to quit smoking, for example, the task at hand will be far easier if you do not drink coffee. Nicotine breaks down caffeine and smokers who are coffee drinkers are subjected to heightened agitation due to increased caffeine intake when they stop smoking. Psychologically, this higher level of agitation is misinterpreted as nicotine cravings. Itβs a vicious circle.
Fair disclosure: I love the aroma of coffee and am a coffee drinker and a smoker. They are like bad friends for whom I have developed fond feelings.