Katherine Heigl – Smoking

No matter what the circumstance, smoking is simply a bad habit that a lot of people can’t avoid. “Grey’s Anatomy” star Katherine Heigl, for instance, had a hard time ditching this from her routine, admitting that she started this when she was just 20.

Heigl understands that this was bad for her health and, at one point, stopped smoking but got back to it again when she landed her iconic role in “Knocked Up.” She spoke about quitting and doing everything to do so, including chewing gum but to no avail. She joins other stars like Jennifer Lawrence, Bella Hadid, and Dakota Johnson, who also occasionally light a cigarette.