Contact high
A contact high is a psychological phenomenon that occurs in otherwise sober people and animals who come into contact with someone who is under the influence of drugs. It involves a supposed transfer of the physiological state of intoxication.
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 or she is on drugs. The term is often incorrectly used to describe the high obtained by inhaling the smoke of other marijuana smokers."