Most Vulcans smell of dust, especially the men. I've been watching Clone Wars lately where they seem to be falling over themselves to show that the Jedi valued each and every clone as an individual, worthy of risking your life for and respect and stuff. And yet they keep making them on Kamino, churning them out and the only life they give them is a white suit of armor. The Jedi keep making speeches about how they value whatever clone they are talking to, it's a total mindfuck.
If the Federation had a clone army it would be a gold mine for all the Roddenberry ethicists who see Trek as veering from its foundations and losing its high ground. All that racism stuff is finished for tv, the gay stuff they missed the boat on.. creating their own ongoing ethical dilemma for Captains to opine over is the only answer to staying fresh.
There's no way they'd give the formula to the Klingons or Romulans to do, they would fear what what use they'd put them to after the war.