As far as answering, there are a lot of ways, and it also depends on how much you’ve been smoking. The best ways are slowly lowering your dose (takes a long time sometimes), or going cold turkey (which is faster, but harder). Either way, the last thing is making the decision to quit, so you’ll eventually have to deal with the withdrawal.

For the most part, when you deal with withdrawal, you’ll just have to tough it out, but there are some things that can help cleanse out the toxins and may help to minimize some of the effects of withdrawal…
Drinking water will help to detox, and taking some supplements that work as cleansers may help as well. Specifically, Apple Cider Vinegar, Green Tea (decaffeinated), Chlorophyll (fantastic cleanser), and even good amounts of fiber and water helps some people (although it’s not very comfortable for the lower level of detoxification you get).

All that being said, it’s likely that the symptoms should stop relatively shortly after your last smoke (it’s never as long as it feels like it is). Your neurotransmitters don’t take too terribly long to scream for something they are addicted to after you stop.
Another important thing to note is that no matter how bad it gets, taking more of the drug (and yes, nicotine is a drug) will only make the withdrawal last longer and will be harder on you in the long run. Good luck, and congrats again!