Contact high is a phenomenon that sometimes occurs in people and animals who come into contact with someone who is under the influence of drugs. It involves a supposed transfer of the psychological state of highness. This is often attributed to things such as stale latent cannabis smoke and transcutaneous transfer of psychoactive chemicals. However, this may be better explained by the subconscious picking up on the user's "vibe" and sociological factors. A glossary of drug users' language from the 1970s describes the term as "a psychogenic “trip” without taking drugs by being close to somebody while he is on drugs. It is incorrect to use it for the high obtained by inhaling the smoke of other marijuana smokers."