No. There is no such thing as demon possession.
Warning! Spoiler for the last season! No. Although there were episodes, where demons possessed Sam, he is not a demon. The possessed people are only vessels. And although Lucifer possessed him at the end of the last season, he is an Angel. An Angel in the vessel of a demon seems a little unnatural.
No
Yes they did call people with epilepsy possessed with demon. As we must know that medicine had not advanced as today. And as they could not give a good explanation, the easiest would be devil possessed. The above answer is incorrect. There was distinctions made between people that were sick and demonic possessed. There was also distinctions made between those that were lunatic and demon possessed.
Demon possessed.
Demon Possessed - 1993 was released on: USA: 28 July 1993 (video premiere)
No Criss is not demon possessed. He is a really good goth magician.
Abalam
Yes. In Mark's gospel, as an example, Jesus is described as healing several people possessed by demons.
Yes but be warned demons are unpredictable
A demon-possessed person is a fictional concept, while "insanity" is a legal term denoting a person's inability to distinguish between right and wrong. People with mental illnesses, on the other hand, generally have some sort of physiological malfunction in their brain.
Demons are supernatural beings, they are a completely seperate thing from human. While it may be possible to be possessed by a demon, you cannot be a demon, at least not in your physical form.