lionsandtigers - much sympathy. it is rotten having a non-sleeping baby. we did CC when our DD was 6.5mo, for the same reasons you describe ie dummy addiction.
CC is not an easy option, as it is hard to hear your baby cry. But for those parents who really are at the end of their tether it can be a life/relationship/sanity saver.
It doesn't work for every baby. If you do decide to try it, perhaps do so just for 3 nights, and stop if there's no significant improvement in this time.
The stuff about CC being only suitable for 1 year plus is not correct, but seems to be repeated a lot on here.
You can do as gentle a version of CC as you feel comfortable with. eg - go in every 2 minutes, pick the baby up, soothe them, and then put them in the cot once they've settled. I think it's important to remember that CC isn't actually about the crying, but about babies learning to settle themselves. So you can go in as often as you like, rock them, soothe them , as long as they are place in the cot without whatever prop they need to fall asleep.
I would rather not be described as a CC advocate, but rather someone who was so dangerously tired she was at risk of becoming ill, or crashing the car, with a cranky, overtired baby who herself was in desperate need of a good night's sleep.