They assume everyone is a junkie. If you smoked pot many years back they assume that you are addicted. They find it impossible that a person can quit cold turkey. Everyone but themselves is a drooling addict that needs their help but at a price of course. I find it an insult that they think I don't have enough will power to quit an addictive behavior. Most people do stupid things when they are teenagers and as they grow and mature they realize these things are not right and leave them behind.
PROS: they provide the kleenex
CONS: if you drink a beer you an alcoholic, smoke a joint you're a junkie