This type of work is related to spirit attachment, where a spirit links to someone, subsequently benefiting from the person's energy. In some instances a person may be unknowingly attracting such attachments.
Such situations can be complicated. If attachment is recent, it may be possible to remove it from a person's field in one session. However, it is the responsibility of the individual to be mindful to avoid such attachments occurring again. In cases of long established attachment many treatments may be needed. Once more, without the individuals input to avoiding such things they may return.