As others have noted being smart will enable you to comprehend more of the World around you. This will in turn increase the amount of negativity you can be exposed to.
But in my opinion this ultimately comes down to your thinking patterns. Those must be practiced and learned. If you do not make an effort to adopt positive thinking patterns about the information you perceive you will become unhappy, as the negative patterns appear to be the default. What you become aware of, how you process it and form a conclusion, is your subjective experience.
Most people agree that exercise is healthy for your body. But if your form is lacking you can injure yourself quite severely.
In my experience, low self esteem and harboring negative emotions can be the cause of a "bad thinking form".
Most people agree that exercise is healthy for your body. But if your form is lacking you can injure yourself quite severely.
In my experience, low self esteem and harboring negative emotions can be the cause of a "bad thinking form".