Vaping and e-cigarettes just gets bigger and bigger! So many smokers now have completely switched over from traditional cigarettes to vapour instead. Celebrities are no exception. Here are some of the celebrities we have spotted puffing on e-cigarettes. \n \nKatherine Heigl\n \n The actress and director caused quite a stir when she started vaping on the Letterman show in 2010. Many of the viewers were actually unfamiliar with what an e-cigarette was back then. She announced on the show that the e-cigarettes had prevented her from smoking real cigarettes for 6 months. We wonder if she has still quit the habit. If you don't know about her then she is best known for playing Dr. Isobel "Izzie" Stevens on ABC's medical drama Grey's Anatomy from 2005 to 2010.\n \n \nLeonardo Dicaprio\n \n Leoanardo Dicaprio had all eyes on him when he pulled out an e-cigarette at January's Golden Globe awards. At first many thought he was breaking the smoking ban, but on closer inspection they realized it was just an e-cigarette. Leonardo regularly uses e-cigarettes on set in between shooting his blockbuster movies.\n \nKaty Perry\n\nKaty Perry was spotted with a funky purple vaper and chilling with a beer on Labour Day 2013. The pop star is regularly seen smoking, so it is good to see her switch over to vaping. We think she'd love to vape some of our Grey Haze juice.\n \n \nLindsay Lohan\n\n \nNot famous for looking after her health, it is a surprise to see Lindsay Lohan in the list. Actually, this Hollywood wild child is a huge fan of e-cigarettes and was regularly seen using them when she was under house arrest. Well, she was probably getting them delivered to her door from Grey Haze!\n \n \nHelen Flanagan\n\nHelen Flanagan does not just like e-cigarettes, she actually promotes them! This is a picture of the Coronation Street actress promoting in Manchester for another e-cigarette company. The starlet wrote: "Jodes and I #kiklaunch" and posted a picture of her stylists vaping together.