This is the 3716th most frequent Swedish word.
heroin
Heroin: A highly addictive drug derived from morphine, classified as an opioid.
In this sentence, 'heroin' is used as a noun referring to the narcotic substance.
Han blev beroende av heroin och behövde behandling.
He became addicted to heroin and needed treatment.
Here, 'heroin' is utilized to specify the substance involved in illegal activities.
Polisen beslagtog en stor mängd heroin från smugglarna.
The police confiscated a large amount of heroin from the smugglers.
In this case, 'heroinets' (the heroin's) is the definitive form of the noun, showing possession and referring to its effects.