LSD can and does cause Hallucinogen persisting perception disorder, causing you to "trip" at any time in your life. This has happened to people who have only tried it once, and then had a bad trip 30 years later. A bad trip can range from thinking the world is going to end to causing you to commit suicide (plenty of cases of people ripping their skin off and gorging their own eyes). IMHO it is the single most dangerous drug.
No offence man, but you have absolutely NO clue what you are talking about. I have used LSD probably 30 or 40 seperate times in my life, and have had all sorts of trips ranging from good, to absolutely terrifying. I was even hospitalized one time because I was tripping so hard and thought all these things were happening around me that really weren't, and I have heard it from
highly qualified Doctor's themselves that LSD is almost completely harmless, especially for your physical body. The biggest harm that LSD can cause a person is to their mind... but most people who have "bad trips" regularly, or tend to freak out and get out of control on these drugs are people who already have mental health issues, or who are genetically predisposed to mental disorders such as schitzophrenia and depression etc. If you are one of those people and you decide to take a psychedelic drug, there is a very good chance that you will be bringing that illness up to the surface. But LSD itself is a very safe and clean drug, despite the fact that it is technically "a chemical".
HPPD, and flashbacks, are fairly rare and are more myth than reality. Yes, they do occur, but for HPPD to become very serious and to really negatively affect your life you have to be taking massive doses of LSD repeatedly, so much acid that it infact that it almost puts you in a permanent state of "tripping" where your brain is essentially fried - visual disturbances, problems with listening and paying attention, and a failure of cognitive abilities. Even then in these absolute extreme cases, these effects can go away if you stop using drugs completely and give your mind time to recooperate. But like I said before, this kind of effect is VERY rare, and most people who experience this have done this to themselves by taking extremely large quantities of LSD, repeatedly, over a very long period of time (we are talking years here). Flashbacks are also rare, but do happen from time to time. But saying that you will go into a "full on trip 30 years later" is complete hogwash. A flashback is more like an intense flash-back into an emotional or visual state that you experienced during a psychedelic drug trip, usually triggered by another experience similar to whatever traumatic thing happened to you during your drug trip.
And one more myth I need to dispel - all the rumours you hear about people "gouging out their eyes, ripping off their skin, and jumping out of buildings" is complete BS. There have been VERY FEW cases that have ever been recorded of people doing such things, and most of the ones that do exist are concerning people that are out of their minds on various substances, including ones that actually cause states of delerium and psychosis (like combining LSD with a week long crystal meth binge, or taking multiple psychedelic drugs at once... washing down a few peyote buttons with a nice strong datura tea and eating a couple mushrooms right after with a tab of acid under your tongue). If you believe these stories to be true then I challenge you to find one that has been medically and scientifically documented and is not just posted somewhere on the internet as a claim.
So its unfortunate that your opinion of acid is so negative, but it is most likely not your fault. People's ignorance about drugs usually stems from simply being uneducated, and being stuffed full of government propaganda and false rumours that are passed on by parents/schools in order to steer kids away from using drugs.
if nothing else
