LSD is often an unpredictable drug. While some individuals, sometimes, will report experiences of hallucinations, open and closed eye visuals and the like, others may not or they might not every time they use LSD.  LSD is not considered as dangerous a many other illegal drugs such as cocaine, heroin or crack. Death due to LSD overdose is extremely rare and requires substantial amounts of the drug. This is not to say that overdosing might not be uncomfortable or even deadly because can be. Individuals may pass out, vomit, and suffer from internal bleeding and fever.  The dangers of LSD use do increase, however, when people mix them with other drugs. 

Many of the reported LSD associated dangers have to do with a user’s actions after they have taken the drug. Because they don’t feel like themselves, they often don’t act like themselves either. Their inhibitions will likely decrease and so behaviors or actions they wouldn’t normally engage in, they will after getting high. Also, because a person may begin hallucinating or suffering from delusions, they might begin to feel invincible and thus act dangerously. Some people high from LSD walk out in front of cars or jump out of windows, actions which can be potentially harmful and even deadly.

Long term use of LSD poses a number of risks. Individuals may become severely depressed or experience bouts of depression, psychosis or paranoia. 

In summary, LSD use does have associated dangers, both short term and long term. Concerning the former, individuals are most at risk when they mix LSD with other drugs. A person’s behavior while high on LSD can also be dangerous. An individual’s inhibitions are often lowered after they are high and so they act in ways that they might not normally. Persons might also hallucinate or become delusional. This puts them at risk of engaging in behaviors that can pose a danger to themselves and which might potentially be deadly. These are the potential short term effects. Long term use of LSD has its own set of problems. Individuals may become depressed, develop psychosis and even paranoia.