Oddly Wired
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self control

A minor lapse in control leads to a total collapse.

The 'what-the-hell' effect describes how a small violation of a goal leads to the abandonment of that goal entirely.

When people on a diet eat one 'forbidden' cookie, they often interpret this as a complete failure. Having already 'broken' their progress, they decide they might as well eat the whole box since they have already ruined their streak.

You turn a small bump in the road into a dead end.

Where this comes from

Study
Polivy and Herman, 1985, Journal of Abnormal Psychology
What the check found
The attribution is accurate in substance, as Polivy and Herman are the primary architects of the 'what-the-hell' effect in restraint theory, though it is the result of a body of work rather than one study.
Confidence
Solid, with limits
self-controlhabitgoal setting

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.