Keira Knightley didn't have your typical childhood. She would smoke cigarettes with her mom and talk about sex. Her mom would have Keira roll the cigarettes, and then they would just talk. Keira says her mom was bit mental, but in a good way. She was a chilled out hippie who didn't buy into the norms of society. With a childhood so rolled up in cigarettes, Keira Knightley never fully kicked the habit. If it's hard to quit smoking when you started as a teenager, imagine how hard it is to quit when you started as a kid! It's like how when you learn a language at a young age, it just sticks!