Gary Oldman got nicotine poisoning from smoking too much for Darkest Hour.
Smoking kills, but don't tell Oldman, who reportedly smoked around $30,000 worth of cigars to help him get into his role as Winston Churchill.
This resulted in him getting nicotine poisoning throughout the shoot. The one bright side was that he claims he hasn't had one since, but it was still dangerous as hell.
Me too, Pal.