People believe that Lucky Strikes are called so because you'll find a pot joint every once in a while!
It's claimed that every so often you'll get a Lucky Strike cigarette with marijuana hidden in it. Yes, people believed that the brand would hide a joint once in a while in their cigarette cartons. Although there's no clear origin for this myth, popular urban legend site snopes says that it's been around for a while.
This is, of course, not true. However, the brand didn't help themselves with their slogan "It's toasted." This referred to the tobacco being toasted instead of sundried, which supposedly made for better products.
The marihuana rumor is often used to explain why people "flip" a lucky upside down in the pack. They were were saving the "lucky strike" they got for last.