Any drug or situation that bears enough resemblance to past LSD experiences can trigger flashbacks. A song can do that as well. It is a misconception that this would happen spontaneously. It is also not true that LSD flashbacks or flashbacks in general are horrible experiences by definition. It is nothing more or less than an extremely vivid remembrance of a past experience, so vivid that it were almost as if you were back there.
LSD and possibly shrooms.
LSD
Physically, no, LSD is not bad for you. However, you can have a bad trip regardless of if you know how to use it or not and these trips may cause anxiety, depression, and flashbacks.
Yes, it is possible to have a flashback from any psychedelic drug, although flashbacks appear most common with LSD (this may be merely because LSD is the most commonly used psychedelic).
Acid flashbacks are one of the long-term effects of LSD use, and can interfere with a person’s daily life even months or years after they use LSD. Scientists still know little about what causes them or how to treat them. Keep reading for more on acid flashbacks.
No, having a back problem wouldn't increase the risk of flashbacks.
Almost all drugs can cause flashbacks depending on the tolerance of the user, but Lysergic Acid (LSD) is the most commonly known flashback induced drug, some flashbacks occurring up to 3 years after the last dosage, but continued use prior to that period would be needed to induce such a flashback. The occasional use is unlikely to cause a further 'trip' later in life.
Flashbacks in those who have used psychedelics are a poorly understood phenomenon. It is thought that neurological changes may lead to the temporary return of an LSD-like state, but this theory is not well-researched.
Weed, unlike LSD, is not known to cause flashbacks. You are only high while smoking it, not 3 days later.
Lysergic acid, also know as LSD and acid.
Essentaly, it is a memory of an LSD experience, however due to the mental effects of LSD, it causes the person to feel as though they are on LSD again. Typicaly Flashbacks only happen up to a year after the experience, some people report it long after.
No, LSD does not cause physiological dependence.