Atlantis Tank gets hot!

I have had my Atlantis tank & sub ohm battery set up for about three days now and starting last night I found that the tank gets pretty hot with use, is it normal or defective? I understand it's nature is to heat up but by how much? I mean it gets too hot to hold. My usage is about 1 hit every minute to a minute and a half for no longer than 20min. So is it me or the device?

I used to use the istick with the mini and never had this issue.
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