When you lose the fight and decide to go for some sugar/fiber just once, don't eat chocolate. It is poison.
Instead, mix yourself something of these:
Erythritol
Stevia
Natural honey
Tallow
Salt
Butter
Sour cream
Cheese
Coconut oil
Ground coffee or instant coffee
Better not, but if you have to: rice, wheat, coconut, rye, corn, barley flour.
Dried plums, raw banana, and raw ripe papaya occasionally in modest quantities may be beneficial. They are also a source of sugar for when you give up. But they will not satisfy craving for chocolate, but the above list will.
Any time you can replace these lost battles with winning them, do it. Anytime you can replace losing to sugar to losing to coffee (black unsweetened) or tea (any color unsweetened) - do it. Losing to unfiltered real cigars without directly inhaling into lungs - do it. Smell the smoke that you blow out, don't inhale it directly. The smoke that goes up from the burning end of cigar - let the wind take it. Don't even smell that. Tobacco leaves are the filter that makes the smoke god enough to taste and to smell. Not to inhale directly. All other filters make the smoke worse, not better.