lucky

A 'lucky' is also slang for that one cigarette you turn upside down in a pack to be smoked last. Generally, one makes a wish before lighting their final cigarette.

Presumably, something like 'I hope I have more smokes'.

Luck"y (?), a. [Compar. Luckier (?); superl. Luckiest.]

1.

Favored by luck; fortunate; meeting with good success or good fortune; -- said of persons; as, a lucky adventurer.

Spenser.

2.

Producing, or resulting in, good by chance, or unexpectedly; favorable; auspicious; fortunate; as, a lucky mistake; a lucky cast; a lucky hour.

We doubt not of a fair and lucky war. Shak.

Syn. -- Successful; fortunate; prosperous; auspicious.

© Webster 1913.