In that link, the third paragraph states: "At 70% relative humidity (a measure which by definition is independent of temperature) cigar leaves become pliable without swelling."
Well, they are wrong. RH does in fact depend on temperature, but it is not included explicitly. The behavior of RH vs. temperature is implicitly included in how RH is defined. The definition of relative humidity is the ratio of the water vapor density to the saturation water vapor density, expressed as a percent.
Gee, that's funny... the saturation vapor density depends on temperature, so RH automatically depends on temperature!
Here's a graph of how the saturated vapor density of water behaves with temperature:
http://www.aquair.com/satdenwater.htm
The part that this Dr. Patton is talking about when he says that the water tends to stay in the air at higher temperatures and it tends to condense at lower temperatures is just another way of saying that RH depends on temperature... so he's contradicting himself.
Just because he's a medical doctor doesn't mean that he knows physics. Yeah, maybe he knows biology, but in med school, they don't get an education in physics. I've taught 6 semesters worth of pre-med students in physics and their knowledge is typicall really good in biology, but they don't know crap about physics, nor do they want to.
-JT
