I just want to put in my opinion on this. Scaring a smoker into quitting doesn't work.
I remembered several years ago I wanted to quit for good so I tried to scare myself by looking at the quit smoking TV Ads, and videos that shows all horrible illness from smoking, the damaged lungs, the people dying from smoking diseases with tubes hanging out from their noses, their throat, the hole in the neck, they could hardly breath but still tried to plead to smokers to quit before it's too late. I wasn't able to quit long, eventually I chose to ignore it, to convince myself that it doesn't happen to everyone, I convinced myself to exercise to offset the smoking, etc. Like every addict, I lied to myself so I could smoke again.
Most (or almost every) smokers know smoking is extremely bad for their health, they know the damages that smoking can do to their body, but they still choose to ignore it, simply because they don't understand the Nicotine addiction and they're powerless against it. I believe the education about the Nicotine addiction is most beneficial key to quit smoking, it has been helping me tremendously. After 3 months, I know I no longer have any actual withdrawal, I understand that any "cravings" I have now are just mental so I can get by them much easier than before, I know now that smoking doesn't help to relax, doesn't help to concentrate, doesn't help ANYTHING period. And I no longer want to be slaved to the Nicotine addiction.
The knowledge from educating myself about the addiction helped me quit, but knowledge about health damage didn't. Just my 2 cents.