I'm not so good in the old impulse control department either. Do first think later seems to be my motto sometimes. Often I can see 'I am going to regret this later' flashing through my brain - but it just isn't as loud as the 'screw it - lets do it' voice. Hmm. Delay.

Mindfulness meditation is good for learning impulse control (in theory).
You feel an itch and you just feel that itch and resist the impulse to scratch.
You feel an impulse and count to ten
Take deep breaths
Then hopefully at the end of the ten you can resist the urge.
Ah.
Theory theory theory...
Let me know if you find anything that works