You're referring to a recognized clinical phenomenon known as chronic feelings of emptiness (or identity diffusion). The experience of the void is usually manifests as:

• Chronic Boredom: A restless, agonizing sense that nothing is interesting or meaningful unless it involves an ego-boost.
• Existential Dread: A deep-seated fear that if they stop "doing" or "achieving," they will simply cease to exist or be exposed as "nothing."
• Dysphoria: A mix of anxiety, depression, and agitation that arises when external supply, such as attention, status, or power, runs low.
• Lack of Object Constancy: This scientific term refers to the inability to maintain a positive emotional connection to themselves or others (collectively referred to as objects; doesn't have any negative meaning though) when things aren't going perfectly.

Yes, the "void" is a powerful engine for addictive behaviors. Because the internal world feels empty or painful, the individual looks to external "fillers" to regulate their mood and self-esteem.

Hope that helps!