Smoking tobacco cigarettes is a tough habit to break and once you try smoking for the first time there is over a 50% chance that you will becoming addicted just like Katy Perry did. Katy Perry never smoked cigarettes until she was started stressing out over the planning for her wedding with Russell Brand.
http://www.solarcigarette.com/blog/smokeless-cigarettes/katty-perry-smoked-cigarettes-to-calm-her-nerves-but-cant-quit/