Simply do. Find yourself wanting to reach for a soft drink? Grab water or tea or whatever else you've chosen to drink instead. Don't keep them in your home for easy access, and when you're out and about don't buy any. Having someone to help encourage you, especially if they live with you such as a spouse or roommate, can also be great help. I'm trying to discourage my roommate from soft drinks because of how bad they are for him and his teeth, so when we're out I remind him not to buy any and only keep a little bit in the home while he slowly weans himself off of it.
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