Quoting marcus&tristyn♥:" i'm pretty sure the stuff you are talking about is called chantix. it seems to work really well for most people, but there is a slight chance that it can give you crazy mood swings."
I'm a wee bit late but I just had to jump in haha. My dad took Chantix, it made him have insane mood swings (but he did anyways since my mom passed away), and it also gave him horrible nightmares. It really did work though, it took less than 2 weeks and he was completely done, he hasn't smoked in about 2 1/2 years now