i smoked about 5 or 6 cigs a day, and i immediately went to 0mg nic... but i also have one bottle of 12mg and i use that for the morning when the urge to smoke is there (with coffee of course) and that is already fading after only seven days. so most of the day is 0mg and 12mg a few puffs a day when i crave it.
edit: i'm really new to all this, didn't even know there was 6mg available. i'm getting that, as even the 12mg is too strong for me.