The thing about heroin is, it takes you.
Snorted, smoked or injected, heroin's seriously addictive. At least 75% of those who try it "just once" end up using again. Only the more you take, the less it works, and the more you need. Not to get high. Just to feel normal. That's the fly effect for you. It's a nasty spiral, and only heroin is in control.
As of right now, you're not a liar. You're not a thief or a dropout. A victim, a prostitute, a criminal, a bad friend, an untrustworthy sibling or some lost kid sleeping on the streets. You're you. Let's keep it that way.