LSD is a really bad drug. What can happen is people can have a really bad trip and never come down. If you are a really happy go lucky person that probably won't happen, but if you suffer from mental illness you will probably have a bad trip. The only way to come down from a bad trip is to go to sleep and have a nightmare. If you don't go to sleep after 12 hours of the trip, you will stay that way forever. Don't do acid.