Diagnose the cue and the real reward first

You cannot substitute a routine until you know what trigger fires it and what payoff it delivers.

Why it works

A substitution can only succeed if the new routine answers the same craving the old one did, and people are usually wrong about both the trigger and the payoff. The smoking break may be about the pause and the social contact, not nicotine. Pinning down the actual cue and the actual reward is what tells you the specification a replacement has to meet.

How to do it

1. Log each time the bad habit fires: where you are, the time, your mood, who is around, the prior action.
2. For the reward, test alternatives — a walk, water, conversation — and check which one quiets the urge.
3. Write the diagnosis as "when [cue], I do [routine] to get [reward]" before designing any swap.

Evidence

Grounded in reward-prediction and craving research and in the basal-ganglia habit-loop model. The diagnostic exercise is a structured application of those findings rather than a separately trialed intervention. (mechanistic)

The reward/craving science is solid; the self-diagnosis worksheet is practitioner technique built on top of it.

Common mistake

Assuming you already know the reward (sugar, nicotine) and substituting on that guess, so the swap targets a craving you never actually had and fails.