Mythen zijn deels baseerd op waarheden he! 
Dacht je ?
Kijk theoretisch, maar ook wel praktisch

kán je psychotisch worden van zo ongeveer elke drug, zeker mensen met aanleg daarvoor of die zich voor de trip al in een bepaald onstabiele situatie bevinden. Als je daarna (langdurig) wordt opgenomen in een kliniek kan je dat "blijven hangen" noemen... maar zo letterlijk blijven hangen zoals het vaak bedoelt wordt... De stof werkt gewoon uit, wordt volledig afgebroken en er blijft geen restje altijd in je bloed achter, nog in je hersenvocht of in je ruggemerg ofzo (mythe 3 en 4

) dus in die zin kan je niet erin blijven hangen zoals een plaat ofzo kan blijven hangen. Maar voor iemands psychisch toestandsbeeld kan het wel een 'gevaar' zijn.
En flashbacks..je kunt er natuurlijk altijd wel aan terug denken, maar dat je ineens ramhard weer midden in een trip beland ofzo is natuurlijk onzin..je hebt wel iets als HPPD, zie hier beneden..
Het is meer een soort herinnering aan de trip.. het duurt ook niet meer dan een paar seconden.
Dat is het hem meer ja.
Maar goed, misschien handig als de lsd experts e.a. nog eens verder toelichten
Echter wel vast wat leesvoer wat je eventueel kunt nuttigen, bron: erowid:
There is an often circulated myth that once you have taken LSD, it remains in your body forever. One thing that keeps these rumors circulating the is fact that some people (though very few) experience "flashbacks" (generally within a few months after a hallucinogenic experience). It is universally accepted, however, that these flashbacks are not the result of LSD remaining in the system.
LSD is almost entirely metabolized within a day after ingestion. Since the half-life of LSD is only a few hours, only a very small amount of LSD remains even at the end of the trip, and this is excreted in the urine. All traces are undetectable after several days and are certainly gone entirely within a couple of weeks. As detection technology improves and thresholds drop (it is now possible to detect picograms reliably), the time that incredibly small amounts of it could be detected will extend.
It has long been reported that LSD is fully metabolized almost immediately after ingestion. This was based on research done in the 50's and 60s which used instruments not sensitive enough to detect the extremely small amounts of the chemical.
Occasionally, people claim that LSD has been found in spinal fluid years after the last time LSD was taken. There is no support for this claim. If anyone knows of a research article that has looked at spinal fluid of LSD users for LSD, please let us know.
Hallucinogen Persisting Perception Disorder or Flashbacks
from the Diagnostic and Statistical Manual of Mental Disorders IV
from the DSM-IV, p232-233:
292.89 Hallucinogen Persisting Perception Disorder (Flashbacks)
The essential feature of Hallucinogen Persisting Perception Disorder (Flashbacks) is the transient recurrence of disturbances in perception that are reminiscent of those experienced during one or more earlier Hallucinogen Intoxications. The person must have had no recent Hallucinogen Intoxication and must show no current drug toxicity (Criterion A). This re-experiencing of perceptual symptoms causes clinically significant distress or impairment in social, occupational, or other important areas of functioning (Criterion

. The symptoms are not due to a general medical condition (e.g., anatomical lesions and infections of the brain or visual epilepsies) and are not better accounted for by another mental disorder (e.g., delirium, dementia, or Schizophrenia) or by hypnopompic hallucinations (Criterion C). The perceptual disturbances may include geometric forms, peripheral-field images, flashes of color, intensified colors, trailing images (images left suspended in the path of a moving object as seen in stroboscopic photography), perceptions of entire objects, afterimages (a same-colored or complementary-colored "shadow" of an object remaining after the removal of the object), halos around objects, macropsia, and micropsia. The abnormal perceptions that are associated with Hallucinogen Persisting Perception Disorder occur episodically and may be self-induced (e.g., by thinking about them) or triggered by entry into a dark environment, various drugs, anxiety or fatigue, or other stressors. The episodes may abate after several months, but many persons report persisting episodes for 5 years or longer. Reality testing remains intact (i.e., the person realizes that the perception is a drug effect and does not represent external reality). In contrast, if the person has a delusional interpretation concerning the etiology of the perceptual disturbance, the appropriate diagnosis would be Psychotic Disorder Not Otherwise Specified.
Diagnostic criteria for 292.89 Hallucinogen Persisting Perception Disorder (Flashbacks):
A. The re-experiencing, following cessation of use of a hallucinogen, of one or more of the perceptual symptoms that were experienced while intoxicated with the hallucinogen (e.g., geometric hallucinations, false perceptions of movement in the peripheral visual fields, flashes of colors, intensified colors, trails of images of moving objects, positive afterimages, halos around objects, macropsia, and micropsia.
B. The symptoms in Criterion A cause clinically significant distress or impairment in social, occupational, or other important areas of functioning.
C. The symptoms are not due to a general medical condition (e.g., anatomical lesions and infections of the brain, visual epilepsies) and are not better accounted for another mental disorder (e.g., delirium, dementia, Schizophrenia) or hypnopompic hallucinations.