Let's take a look at a couple scenarios.
1. You quit on Sept. 28, your birthday. You say you're not going to have any dip that day, because you've made a resolution. You make it to about 11 AM before the craves get unbearable. "It's my birthday," you say. "I don't want to spend the whole day in this hell." You go out and buy a can. We all know how that one goes.
2. You quit on Sept. 28, your birthday. You say you're not going to have any dip that day, because you've made a resolution. And you don't! Congratulations, you're quit one day. Your birthday is also a living hell, as are the next two days. You can't drink, because you'll cave. You're an asshole to all your friends. Years later, you'll say the day was so hazy you can barely remember your birthday.
3. The moment you read this, you take the dip out of your mouth (just a guess based on personal experience, no offense intended). You throw it down the toilet. You search out any evidence of dip, any cans and spitters any dried out tobacco from where you spilled and throw it out. You post roll NOW, promising not to have any more tobacco / nicotine today. You do that tomorrow. And the next day. Sept. 26 rolls around ... you are on Day 14, all the physical craves are gone and you're feeling great. You're starting to see through the haze, and you can enjoy the day knowing you are quit for good, because you'll continue quitting One Day At A Time.
Just a thought.