You've probably read at times that psycho-active drugs have the potential to open 'doorways to the other side'. The more you use them, the greater the chance. The same openings can occur with intense meditation techniques, intense concentration (eg, being in a military exchange) and also with sudden psychological shock or prolonged psychological trauma (such as violent abuse).
And the danger is this: Once that psychological door opens, thought-forms from the subconscious, including those in the various worlds of existence, whether it be demons or angels, from the lowest hell to the heavens above will, depending on what the person's mental predisposition is at the time, attract those thoughts and entities to himself and they will attach to and become part of the his everyday personality. e.g. if a person is mean and has nasty thoughts towards humanity, there's a good chance he will attract to himself more of those thoughts, eventually leading himself into a mental state where he'll go out and do some damage to his fellow man. Another example would be that if you are someone that thinks about sex a lot of the time then, there's a good chance you'll become hyper-sexual.
The other characteristic worth mentioning is the speed at which this happens. If the doorway opens, even if only for a split second, the attack is instantaneous. The thought-forms, entities, etc, go straight in and attach to the person. That is why advanced mystics always protect themselves first.
This can happen to 'normal' people in everyday life too! (Without taking drugs). e.g., Some people can get really obsessed about things and then the obsession then get's out of control. Not all obsessions are detrimental, but alot of them are. e.g. dieting leading to anorexia. But most people will not experience this. The majority of humanity is mostly resilient towards psychological attack, have stronger psychological barriers, etc.
It's also worth noting that most people are under the 'curse-of-the-law' and because of this, they tend to get the really bad end of the psychological stick.
Biblical:
"When an unclean spirit comes out of a man, it passes through arid places seeking rest and does not find it. Then it says, ‘I will return to the house I left.’ 25 On its return, it finds the house swept clean and put in order. 26 Then it goes and brings seven other spirits more evil than itself, and they go in and dwell there. And the final plight of that man is worse than the first.”
- Luke 11:24, Matthew 12:43
Think twice............ think carefully
) used in the '60s and '70s. But now the legal genie is out of the bottle...