There is proof of it. Such as fossils, records, videos, etc. Dinosaurs and Thylacines for example. Both of these have been extinct for quite some time. Although there is footage of some Thylacines there isn't any of any Dinosaurs. However, there is fossils and bones found from Dinosaurs. There has been fossils from many extinct animals dating back millions of years, therefore proving its a common event through history.
That one is being watched or followed (paranoia)
Very strange behavior, seeing, hearing or smelling things that aren’t there, not being able to tell imagination from reality (psychosis)
Panic
Hallucinations
Loss of sense of personal identity
Lowered reaction time
Increased heart rate (risk of heart attack)
Increased risk of stroke
Problems with coordination (impairing safe driving or playing sports)
Sexual problems (for males)
Up to seven times more likely to contract sexually transmitted infections
than non-users (for females)
