These visions happen more likely to those who are overdosed on the drug. A person is also more likely to see visions if he or she is going through some trauma in their lives either in the present or in the past. The extent of impact all depends on how much the event effects the person. The use of cocaine can also lead to feelings of paranoia and anxiety. It has been suggested that the visions of people under the influence of cocaine are the product of an instinctive sixth sense which can produce deep insights. (5) Eventually, the drugs will bring back the long lost memories of someone's childhood through their visions especially if the person has a stress factor. In Lost Girls, Barth was experiencing these visual hallucinations since he was under the influence of cocaine. The stripper introduced in the beginning of the novel is a significant example of a visual hallucination made in Barth's mind. When he meets this stripper, he feels as though he knew her from his past life which is interesting because this stripper doesn't really exist, instead he is making this image of her in his mind and basically, trying to remind himself about his past even though he doesn't know it himself. His first conversation with her: ""But I know you," she whispers. Something in her voice moves me back against the wall. It was as if I had met her once before." (3, Pg.107) After Barth heard about "The Lady of the Lake", he started to see visions of her before he would go to sleep and when he would wake up in the morning. She would always be there to haunt him as though she wanted to inform him about something. Even though, these visions were made in Barth's mind, they still brought him to realize the truth about himself and his past. .
Auditory hallucinations are another medical problem to those who take drugs such as heroin and cocaine. The phenomenon of hearing voices really frightens some people especially adolescents who are usually only "experimenting" with the drugs.