Quitting smoking is one of the hardest habit to break. Many people have turned to e-cigarettes to help. But are they safe? Do they work? 

Dr. Faisal Ahmad is my guest in tonight's Ask the Doctor segment. He's a pulmonologist with Mountain Medical Pulmonary and Sleep Center. He can answer all your questions about e-cigarettes and lung health in general from 5 p.m. to 6 p.m. tonight.  Just dial 775-858-2222.  

For future questions, you can call his office at 775-882-2106.