My last period of giving up a few months ago for seven weeks was withe the aid of champix as everything else had failed, except for perhaps patches where I found if I stuck them over my eyes I couldn't find my baccy to smoke it.
I t causes depression they say, well I suppose quitting an addiction does, but the drug aside, I was already on meds to combat depression, so, safe, mind what I am one has been described to have similar effects to legal grass, it's actually used for people coming off drug addiction, so I guess coming off smoking, it works for that too, because nicotine is a drug that some smokers are addicted to.