das Heroin
heroin
A highly addictive, illegal drug that is made from morphine and acts as a narcotic.
Der Besitz von Heroin ist in den meisten Ländern streng verboten.
Possession of heroin is strictly prohibited in most countries.

heroin
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heroin
A highly addictive, illegal drug that is made from morphine and acts as a narcotic.
Der Besitz von Heroin ist in den meisten Ländern streng verboten.
Possession of heroin is strictly prohibited in most countries.

In connection with using the drug, verbs such as 'nehmen' (to take) or 'konsumieren' (to consume/use) are used. The consequence is often described with 'von Heroin abhängig sein' (to be addicted to heroin).
Er ist seit mehreren Jahren von Heroin abhängig und braucht dringend Hilfe.
He has been addicted to heroin for several years and urgently needs help.
In the context of crime, 'Heroin' is often combined with verbs such as 'schmuggeln' (to smuggle), 'verkaufen' (to sell), or 'mit Heroin handeln' (to deal in heroin).
Die Bande wurde verhaftet, weil sie mit Heroin gehandelt hat.
The gang was arrested because they had been dealing in heroin.
Since 'Heroin' is a substance (an uncountable noun), it is often used without an article in general statements. You are talking about the substance as a whole.
Heroin ist eine sehr gefährliche Droge.
Heroin is a very dangerous drug.
cocaine
'das Kokain' and 'das Heroin' are both illegal and very dangerous drugs. They can be confused because both often appear in similar contexts, such as police, health, or addiction. However, they are not the same: cocaine tends to have a stimulating effect, while heroin tends to have a numbing effect and is highly addictive. In reports or conversations about drugs, you should therefore use exactly the right word.

Beim Arzt sprach der Mann offen über seine frühere Abhängigkeit von Heroin.
At the doctor's office, the man spoke openly about his former addiction to heroin.
Die Polizei fand Kokain in einer Tasche am Bahnhof.
The police found cocaine in a bag at the train station.