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How to Improve Impulse Control

Habit formation involves creating physical connections in the brain. That's why deeply ingrained habits can't be changed by simply invoking will power. But we can increase our ability to control impulses to follow bad habits we've formed, even those that have reached the level of addiction. It takes attention and persistence (AKA work), but it can be done. And the benefits can be huge.
I think it's worth noting that the theory that exercising willpower depletes it has been disproven.
Jennifer Kromberg, PsyD, lists "6 Steps For Personal Change" that you may find useful.
Paul McKenna’s aversion technique may work for you, and so may psychologist Chris Ferguson’s advice and Alex Lickerman's idea of distraction, avoidance, and acceptance.
Some people are helped by hypnosis (more here), but I’m not one of them. I can't let go when someone tries to hypnotize me.
Also, reminders, including texted reminders can help, as can
Setting goals, but smallrealistic, and specific (more here) ones, internalizing themrecording them, and recording progress against them;
Making time for planning and carrying out steps toward meeting your goals, including if-then planning to replace a bad habit with a good one or ignoring the temptation;
Getting help from others (more here and here) or a buddy with the same goals (more here), and putting positive people in your life, especially people who have good impulse control, or just getting enough social contact;
Boosting serotonin levels (more herehere's how);
Making sure dopamine levels are neither too low nor too high;
Exercising (more here), especially short bouts of exercise, and even if while watching TV;
Spending time in green spaces (more here), or even imagining relaxing on a sandy beach;
Reducing stress, including practicing inherent mindfulnessmindfulness meditation (more herehere, here, here, and here), especially IBMTZen, or Yoga (more here);
Making a fisttaking a walksnapping a rubber band you keep on your wrist, or sniffing peppermint (or banana or apple), or using other distraction techniques (more here), when tempted, including playing Tetris;
Thinking about long-term consequences or potential rewards (more here);
Avoiding sugary drinks and even those with artificial sweeteners;
Keeping blood sugar levels steady (more herehere, here, and here), getting enough sleep (more here and here), and making sure the body’s natural rhythms aren’t disturbed;
Not allowing oneself to get hungry, angry, lonely, or tired (HALT, a 12-step acronym);
Avoiding temptation (more here and here);
Imagining you’re eating the food you crave (more here), engaging in a simple visual taskrinsing the mouth with sugar water (more here), or puting off eating it without specifying when, or, if giving in to temptation, eating slowly and savoring the treat (more here and here);
Externally applied LED light therapy (which also fights wrinkles, by the way);
Using cognitive therapyinhibition training, or character strength training to train oneself to be less impulsive;
Preventing or treating depression (here's how); and
Some medications (more here and here).