Welcome to QuitTrain, @Kris You are doing a great thing in quitting smoking. Any reason to quit smoking is a great reason to quit. Your personal health and wanting to be around for others are great reasons.
Without going into great detail, I just grew sick of all the crap that went along with smoking (the smell, being out of breath, horrible smokers cough, the financial cost, being looked down at in an increasingly anti-smoking society, etc. etc. etc.) and decided to take my life back. It was tough at first but the support and knowledge I got from a site like this really helped.
Quitting smoking is a great thing and I am glad you are doing this.