>> i don't know what to say, sir. >> reporter: for "nightline," brian ross, abc news, hemmit, california>>> up next, he's known as the king of snapchat. now he's beyonce's opening act and collaborating with jay-z on "i got the keys." inside the world of dj khaled. i'm mary ellen, and i quit smoking with chantix. i have smoked for 30 years and by taking chantix, i was able to quit in 3 months and that was amazing. along with support, chantix (varenicline) is proven to help people quit smoking. it absolutely reduced my urge to smoke. some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. some had seizures while taking chantix. if you have any of these, stop chantix and call your doctor right away. tell your doctor about any history of mental health problems, which could get worse or of seizures. don't take chantix if you'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