Traffic accidents claim lives daily. Then there are electrical short circuits, or even choking through unmindful eating. It not only means your life, but also others. If you are mindful at the moment of death, it can mean a happy rebirth. If not it can mean hell.
Mindfulness means meritorious kamma and defilements mean unwholesome kamma.
In the Noble Eightfold Path, the fulfillment of morality, concentration and understanding depends on the building up of mindfulness. Without mindfulness, there cannot even be any moral base. Finally, the culmination of insight is that extremely strong and sharp mindfulness that penetrates through the thick veil of ignorance to realize that everlasting Peace, Nibbana. So until then, please try to be as mindful as possible, to get out of the cycle of birth and death, suffering, Samsara. The main idea is to develop this awareness until it becomes habitual and continuous, and then apply it for more specialized purposes, such as gaining knowledge and skills.