ACTUALLY, if you'll check the internet you'll find that LSD-25 tolerance dissipates after 3-4 days of non use. The decrease is so massive, that as long as the user spaces his/her uses out 4 days apart each use, it will be as if it is their first time using LSD every time. Source: erowid, bluelight, etc.
However I do agree that drugs can be dangerous if used incorrectly without taking the necessary precautions prior to using them. Drugs affect everyone differently, this statement cannot be said enough as it is very true. While most drugs produce common symptoms in all of their users, some aspects can be drastically different depending on the person's overall tolerance and sensitivity to whatever drug they may consume. LSD being a power psychedelic substance has the capability to mentally cripple somebody for Life if important cautionary actions aren't taken before dosing. One of the main things with LSD is set and setting, this cannot be said enough. Make sure the LSD is consumed in a controlled and safe environment, that way no third party interference can occur involving unexpected and/or outside entities/influences. Example: your friends house while his parents are out of town for a few weeks, on the other side of the country with absolutely no possibility of them OR ANYONE UNEXPECTEDLY showing up. Unfamiliar faces and staring eyes can make an inexperienced user highly uncomfortable and freak out, causing them to get what is called "the fear" among LSD users these days.
a lot of hallucinogenic drugs are sold as LSD, they produce somewhat similar effects but have worse adverse side effects in some users. also these drugs are pretty new compared to LSD-25 and require a heavy amount of research and official study be done before it can be concluded whether or not some of these substances are safe to consume in both short term and long term use. for a more detailed guide on these other drugs that get sold as LSD (so common you've probably bought them multiple times if you've taken LSD more than a handful of times) check out = *click*