People who abuse drugs, often do not know they are abusing it themselves. In contrast to popular believe, no one gets hooked on drugs instantly. Addiction is often a slow process, involving repeated intake over time, which forces the body to rely on them. Drug addiction is a complex “disease” that can’t be easily solved with just willpower or moral principles.
Most drugs work by forcing your brain to release tons of dopamine, or the chemical that keeps you happy, so much so that it gives you that “high” (Research has shown that blocking dopamine receptors could instantly stop heroin cravings, but at the cost of, you name it, depression). There is the common misconception that you get instantly addicted, you can use it daily for weeks with no withdrawal effect whatsoever. The mindset becomes “why not use it again?”, no cravings until one day, a switch flips inside, usually felt like the flu, which is instantly “cured” by a dose of heroin. You start with pills but turns to the needle only after you become addicted.