The machine gun fire of a cigarette smoker's daily intake of their drug is a roller coaster of euphoria and guilt and shame, when you know you're an addict. Shaming an addict just fuels the low, adds another inner voice that will whisper sweetly how easy it will be to numb not just that shame, but all the negative things, and all the nervous energy.
I never feel so alive as when I'm killing myself, the secret unconscious thought of the both the addict and the suicide.
Telling an addict they should quit might very well be the best reinforcement of an addiction coming from a non-addict at times.
It is riding those waves that is so hard to break, even when your body has shaken the physical craving of nicotine.