Existentialism

Andy Warhol 1928 - 1987:

Warhol influenced fashion, pop, music and culture. He is known for his Screen Tests, silent film portraits of celebrities and friends filmed in a factory (a good website: http://www.warholstars.org/filmch/screen.html). Some candidates were high on heroin for these films. This links with existentialism due to heroin giving the sense of no past or future. Under the influence people feel no worry for the future, no interest and no boredom. The neurons for pain and pleasure are also turned off (this is why people feel cold when coming off heroin, wanting to take more). In The Outsider by Camus the main character Meursault could well be high.

In the 1960s and 1970s there was a lot of heroin chic in music and fashion (pale skin, dark eyes, jagged bones). Also aspects of the androgynous, for example Edie Sedgwick one of Warhol's superstars, was thin, 1.63m tall and often wore her hair short looking like a beautiful man. Warhol himself was homosexual.

Politics:

The 'old left' from Marx is about economic oppression and the 'new left' is concerned with racism, personal oppression as from Hiedeggar - the past which is guilt and the future which is fear.

Existentialist Authors Love Writing About Junkies:

The Naked Lunch by William Burroughs 1959.
 
The Electric Kool-Acid Test by Tom Wolfe 1986  where the author writes as a literal journalist in the genre of hysterical realism. Wolfe travels with the band the Merry Pranksters, the dangerous drug LSD (Lysergic Acid Diethylamide) is involved.... as are hallucinations.