According to social-psychological theory,almost all illegal drug use can be traced to psychological problems such as poor self-concept and low self-esteem.

This statement is not entirely true. While psychological problems can contribute to drug use, there are many other factors that can also play a role, such as environmental influences and social pressures. Additionally, not all drug use is illegal, as some prescription drugs can also be misused. Therefore, it is incorrect to generalize and attribute almost all illegal drug use solely to psychological problems.