Knowing that one is able to stop consumption of chocolate is like trying to stop oneself from a runaway train by hitting the breaks. you know its useless but you just gotta try anyway. of course there's always that chance that something will get in ones way of chocolate and will most likely either end up being flattened or screaming along all the way down to the next stop.
Limiting yourself is part of the enjoyment. Yes, there is half a packet sitting downstairs, and I can take one or not, anytime I please. There's a kind of joy in that. P.S. j_k - it's chocolate we're talking about here, not orgasms.