When people feel that they have been hexed, cursed, jinxed, or psychically attacked, an ordinary cause can usually be traced for the supposed hex. No matter how certain these people are of their condition, they are simply victims of life and their own fears and worries. A run of accidents, mishaps, illnesses, financial and emotional losses, even car trouble will provide the basis for imaginary hexes.
Although most hexes are imaginary, some are not. Additionally, it is a well-attested fact that the mind has a powerful effect on the body. If a person believes him- or herself hexed, its physical effects (if any) will usually manifest.
Thus many herbs are used for their traditional ability to remove evil spells and curses. They work—whether a hex exists or not.