It probably does, giving a small contribution to the "atmosphere" of the moon. A cubic centimeter of lunar atmosphere contains about 10^6 particles (compared to

It probably does, giving a small contribution to the "atmosphere" of the moon. A cubic centimeter of lunar atmosphere contains about 10^6 particles (compared to 10^19 on Earth), and according to the article, the Earth's geocorona at that point only has 0.2 particles per cubic centimeter. Of course, the lunar atmosphere is constantly being stripped away as well.