Cash Advance Interest Rates - Low?

While looking at my latest credit card bill, I just realized that my cash advance interest rate is only 1.9%. That got me thinking.

• Could I use a cash advance from this card to pay down some of my other debt?
• Should I do that?

What do y'all think? I'm tempted to do it, as it would definitely be a cheaper option for me, as the lowest interest rate I've got somewhere is 3.9%. Hmm...