I've been someing for about 7-8 years solid, and Ive given up for a few weeks/months in the past, normaly due to droughts, lack of cash or just feeling like it's stopping me doing the things I want, but whenever I'm off it I just miss it and end up smoking so many cigarrettes that Im actualy spending more money giving it up, and damaging my lungs a hell of a lot more.
It's down to personal choice, but as long as you've got no problem with things like the hassle of getting it sometimes and can hide it well enough to not get in any legal trouble there realy is no reason to give it up if you enjoy it.