Which aspect of addiction is primarily associated with the desire for more of the substance or behavior?

The aspect of addiction that is primarily associated with the desire for more of the substance or behavior is drug-seeking. This behavior reflects the compulsive and often uncontrollable urge to pursue and consume the addictive substance or engage in the addictive behavior despite potential negative consequences. Drug-seeking can manifest in various ways, including cravings, planning and prioritizing time to obtain the substance, and even engaging in illegal or risky activities to secure it.

In contrast, habituation refers to the process where repeated exposure to a stimulus leads to a decrease in response, which does not necessarily relate to the intense desire for more. Pleasure-seeking highlights the initial gratification or pleasure derived from the substance but does not capture the compulsivity associated with seeking the drug. Withdrawal symptoms involve physiological and psychological effects experienced when the substance is not available, which may drive seeking behavior, but are not descriptive of the inherent desire itself. Thus, drug-seeking encapsulates the persistent drive to attain more of the substance central to the cycle of addiction.