Anxiety. While waiting for their next dose of drugs, many individuals will begin to feel anxious or unsettled. Friends and family report that their loved one has trouble sitting still or staying focused on a single task for any significant amount of time. This anxiety and lack of focus can cause them to slack on job responsibilities and even lose their job. Relationships are also negatively affected by drug-induced anxiety. These are just some of the ways anxiety permeates the life of the drug addict.