The Oxford Dictionary of New Words: A popular guide to words in ...

1.10 angel dust...
Waterfall Vegetarian Food...is launching its new range
of alternative salami slices with its Vegelami slice.
Grocer 21 Jan. 1989, p. 168
The...Trust will invest in companies working to ensure a
better cleaner environment (waste processing,
alternative energy, recycling, etc).
Green Magazine Apr. 1990, p. 82
angel dust
noun Sometimes written angels' dust (Drugs)
In the slang of drug users, the hallucinogenic drug
phencyclidine hydrochloride or PCP (see PCP°).
Etymology: Formed by compounding. The drug was originally taken
in the form of a powder or dust; it may be called the dust of
angels because of the supposedly heavenly visions that it
produces, although it has been claimed that the reason is that
the drug was first distributed illegally by Hell's Angels.
History and Usage: Angel dust was popular in the drugs
subculture of the sixties (when the term was sometimes used to
refer to drug mixtures such as cocaine, heroin, and morphine, or
dried marijuana with PCP). In the eighties angel dust enjoyed a
short-lived revival as one of the preferred drugs of the new
psychedelia associated with acid house; the term became the
usual street name this time round for PCP, which also had a
large number of other slang names such as cornflakes, goon, hog,
loopy dust, and rocket fuel.
She could've been on something...Acid, angel dust.
Elmore Leonard Glitz (1985), p. 69
PCP or 'angel dust', a strong anaesthetic which came
after LSD in 1960s drug fashions...has recently emerged