Novel in Scotland Disaffection" (1989) were among the first novels to fully utilise a working class Scots voice as the main narrator. In the 1990s major, prize winning, Scottish novels that emerged from this movement included Gray's "Poor Things" (1992), which investigated the capitalist and imperial origins of Scotland in an inverted version of the Frankenstein myth, Irvine Welsh's (b. 1958), "Trainspotting" (1993), which dealt with the drug addiction in contemporary Edinburgh, Alan Warner’s (b. 1964) "Morvern Callar" (1995), dealing with death and authorship and Kelman’s "How Late It Was, How Late" (1994), a stream of consciousness novel dealing with a life of
Heroin users, compared to morphine, reportedly stems from its perceived different effects. Short-term addiction studies by the same researchers demonstrated that tolerance developed at a similar rate to both heroin and morphine. When compared to the opioids hydromorphone, fentanyl, oxycodone, and pethidine (meperidine), former addicts showed a strong preference for heroin and morphine, suggesting that heroin and morphine are particularly susceptible to abuse and addiction. Morphine and heroin were also much more likely to produce euphoria and other positive subjective effects when compared to these other opioids. In the United States, heroin is not accepted as medically useful. Under the generic