mom and dad, i have great news. is now providing answers families need. siemens. answers. i honestly loved smoking, and i honestly didn't think i would ever quit. [ male announcer ] along with support, chantix (varenicline) is proven to help people quit smoking. it reduces the urge to smoke. it put me at ease that you could smoke on the first week. [ male announcer ] some people had changes in behavior, thinking or mood, hostility, agitation, depresd mood and suicidal thoughts or actions while taking or after stopping chanti if you notice any of these stop taking chantix and call your doctor right away. tell your doctor about any history of depression or otr mental health proems, which could get worse while taking chantix. don't take chantix if you've had a serious allergic or skin reaction to it. if you develop these stop taking chantix and see your doctor right away as some can be life-threatening. tell your doctor if you have a history of heart or blood vessel problems, or if you develop new or worse symptoms. get medical help right away if you have symptoms of a heart attack or stroke. use caution when driving or operating machinery. common side effects include nausea, trouble sleeping and unusual dreams.