I suggest using shame to leverage yourself into quitting. It's fallen out of favor in our society, but shame really should be a powerful motivator.

I used it to quit smoking tobacco, quit drinking, and quit a 20+ habitual marijuana habit. I use shame to make myself do that extra bit of work in the evenings after my family has gone off to bed. Shame has plenty of good uses if leveraged properly.

Currently hiding in my car smoking at work. I feel like a complete asshole.

I knew it was working for me when I didn't want anyone to ever see me smoking. I definitely didn't want my child to see me smoking. But first it was coworkers or in-laws and such.

I feel the same, I don't have any kids, but my friends do. Feels like shit. Any other advice or recommended reading? Smoker for 27 years.

Associate the habit with someone you don’t like. That’s how I stopped all of my bad habits. Smoking, drinking, herb, going to the bar, eating like crap, not exercising, etc. I just associated each habit with someone I didn’t like or respect.

Then I took a long had look in the mirror and told myself that I was better than that person and that I could make better decisions.