It is almost 3 weeks for me but i'm still feeling the mental side of it. since giving up smoking it has effected my sleep. i get tired and go to bed early but keep getting up throughout the night. Also since stopping i have noticed it has effected my libido. i'm not sure if this is due to stress of the insomnia or some other side effect, like depression, anxiety, etc from stopping. anyway it doesn't help when you're in a new relationship lol.. has anyone else had similar problems and if so, how long does it last for? i'm guessing it's from the insomnia as i haven't had a good nights sleep in almost 3 weeks.