Has anyone else purchased and used the Harbor Freight heat gun?

I purchased one on sale and immediately upon use it starting spewing
smoke from inside. I returned it and, after profuse apologies and a
refund, bought the better unit. Using this gun, for less than 60
seconds, it too spews smoke. Is this common with heat guns or HF?

The only other electrical took I have from HF is an air compressor
which works fine, no smoke. Since this is a glorified blow dryer, I
would think it shouldn't smoke and am concerned about safety.