don't take chantntix if y've had a serious allergic or skin reaction to it. if you have these, stop chantix and call your doctor right away as some can be life-threatening. tell your doctor if you have heart or blood vessel problems, or develop new or worse symptoms. get medical help right away if you have symptoms of a heart attack or stroke. decrea alcohol use while taking chantix. use caution when driving or operating machinery. most common side effect is nausea. i can't believe i did it. i quit smoking. >>> and finally tonight, as the war with isis escalates around the world, russia has joined the fight. on the s side of e besieged syrian leader. we take you to the front lines. here's abc's chief foreign correspondent terry moran. >> reporter: we're inside a russian armored personnel character, tense and cramped, heading for the front lines in syria. the village of salma, which now battle two weeks ago. there's almost nothing left here. we walk the streets, pt the ruins. r three years rebels against the government of syrian president bashar al assad contr