I'm not a smoker, but as others have said, I've seen family members go through the struggle of quitting.
My mum - she's attempted multiple times and the only times she has been successful is all three times that she's known to be pregnant with me and my brothers. She's currently trying right now but patches don't work for her and neither does nicotine gum. She actually went about 4 months without smoking last year up until she was strained with some emotional issues. Her smoking is mostly stress related.
My grandfather - he gained a lot of weight when he first quit. He simply just stopped smoking when he felt like it was time. He didn't use patches, stay away from smokers, or anything to assist him. He just stopped. It's the first time that he's tried to quit after 45 years of smoking and it worked.
You could try patches, nicotine gum, or find any supplement that works for you in particular. It's different for everyone; some can quit without help, some can't without help, some simply cannot quit.
Like I said, I'm not a smoker so I have absolutely no idea how it feels to try and quit.
Good luck though!