Some assert that Mirza Ghulam Ahmad (1839–1908) of Qadiyan (India),  fell victim to such tricks. He attempted to serve Islam by struggling against Hindu Yogism through Fakirism, but evil spirits got control of him. First they whispered to him that he was a reviver (of religion), then that he was the Mahdi (Messiah), and when he was finally under their influence and control, told him to proclaim that he was an incarnation of God.
Sins and uncleanliness invite the influence of evil spirits and unbelieving jinn. People of a susceptible nature, those who tend to be melancholy and those who lead dissipated and undisciplined lives, are their primary targets. Evil spirits usually reside in places for dumping garbage or other dirty places, public baths, and bathrooms.
Jinn can penetrate a body even deeper than X-rays. They can reach into a being's veins and the central points of the brain. They seem to be like lasers, which are used in everything from computers to nuclear weaponry, from medicine to communication and police investigations, and to removing obstructions in our veins and arteries. So, when we consider that Satan and all jinn are created from smokeless fire that penetrates deep into the body, like radiation or radioactive energy, we can understand the meaning of the Prophetic Tradition: Satan moves where the blood moves.
Jinn can harm the body and cause physical and psychological illnesses. It might be a good idea for medical authorities to consider whether jinn cause certain types of cancer, since cancer is an unordered and diseased growth in the body that we can describe as cellular anarchy. Maybe some jinn have settled in that part of the body and are destroying its cellular structure.
Although science does not yet accept the existence of invisible beings and restricts itself to the material world, we think it is worth considering the possibility that evil spirits play some part in such mental illnesses as schizophrenia. We constantly hear of cases that those who suffer from mental illness, epilepsy, or even cancer recover by reciting certain prayers. Such cases are serious and significant, and should not be denied or dismissed by attributing them to suggestion or auto-suggestion. When science finally accepts the existence of the metaphysical realm and the influence of metaphysical forces, it practitioners will be able to remove many obstructions and to make far greater advances and fewer mistakes.
Today, the doors to the metaphysical worlds are only slightly ajar. We are barely at the beginning of contact with jinn and devils. However, one day we will feel constrained to enter these worlds to solve many of their problems pertaining to this world.
The Qur'an states that God bestowed upon the House of Abraham the Scripture, Wisdom, and a mighty kingdom (4:54). This mighty kingdom manifested itself most brilliantly through Prophets David and Solomon, upon them be peace. Prophet Solomon ruled not only a part of humanity, but also jinn and devils, birds and winds: God subdued unto him devils, some of whom dove for pearls and did other work (21:82). Solomon had armies of jinn and birds, and he employed jinn in many jobs: They made for him what he willed: synagogues, fortresses, basins like wells and boilers built into the ground (34:13); and Wind was also subdued to him; its morning course was a month's journey and the evening course also a month's journey (34:12). As pointed out earlier, the throne of the Queen of Saba' was carried from Yemen to Jerusalem by a jinn in the twinkling of an eye (27:40).
The verses relating to Solomon's kingdom point to the final limit of humanity's use of jinn and devils. They also suggest one day we will use them in many jobs, especially in communication. It is quite probable that they also will be employed in security affairs, mining and metal-work, even in space studies and historical research. Since jinn can live about 1,000 years, they may be useful in establishing historical facts.