I would say two and a half.
One is my primary smoking buddy who's off in Iraq right now. I'm constantly blasting him with sticks, and he's started to look for a humi, etc. The other is a friend of mine that always seemed moderately interested in the hobby. He likes to go to the shop with me, and will often go into the lounge and smoke, but never really dove in. He'd been thinking about a humi, so I convinced him if he'd get one, I'd help him fill it. I loaded him up with some spare sticks, bought him a few.
I'm now working on a third. He likes cigars when we get together but doesn't really own anything... yet.
His birthday's in a month, so I'm looking for a nice small humidor for him. That oughta nudge him over.