[Duoctue]

Cà phê cũng có chất làm ghiền chứ. Tôi sáng nào không có 1 cữ cà phê là như con gà rù. 
Còn trà đưa cho tôi thì uống thì phí của giời.
Chắc cà phê là loại thức uống được nhiều người chiều cố nhất.

Đúng là nó có chất caffeine gây ghiền, nhưng theo tôi nghĩ cũng do thói quen nữa chứ khg chỉ thuần tudy chất cafeine gây ra. Mới tìm bài báo cũng có ý kiến giống như tôi nghĩ, xin đăng lại.

Why Does Caffeine Become Addictive?
Just as with other addictive substances, caffeine may become physically addictive. That's because regular, sustained caffeine consumption can lead to changes in the chemistry of your brain.
For instance, your brain cells may start to produce more adenosine receptors as a way to compensate for the ones blocked by caffeine (1Trusted Source).

In turn, the higher amount of receptors requires you to consume a higher amount of caffeine to achieve the same "caffeine fix." This explains how regular coffee drinkers build up a tolerance over time.
On the other hand, abruptly cutting off the caffeine supply suddenly leaves your brain with a lot of free receptors for adenosine to bind to.
This can produce strong feelings of tiredness and is thought to be the main reason behind the caffeine withdrawal symptoms that often arise from going cold turkey (1Trusted Source). 

While daily caffeine consumption creates a physical addiction, the act of regularly drinking coffee may promote a behavioral addiction (1Trusted Source).

Unlike physical addiction, behavioral addiction may not be caused by the caffeine intake itself. Rather, the social environment in which coffee is consumed and the feelings that accompany its consumption are what may encourage you to have another cup. 

That said, it's unclear how large a role this behavioral aspect plays in caffeine addiction. More research is needed (9Trusted Source).

SUMMARY:Caffeine can become addictive through changes it causes in your brain. Additionally, drinking coffee often produces positive feelings, which encourage you to repeat the behavior.

https://www.healthline.com/nutrition/caf...n#section3