Is it supposed to be smoking?

Husband was doing his now regular lumberjacking thing so I volunteered to do some shredding.

'Are you sure?' Husband asked. 'It's hard work.'

'How hard can it be pushing branches through a shredder?'

It is actually quite hard work. The big branches I couldn't force through and the little branches were too bendy to push through. But I'd been merrily shredding for about 20 minutes when that question arose.

'Is it supposed to be smoking?'

'Turn it off!'

It was well and truly blocked.

I did wonder why more seemed to be going in than was coming out but I put it down to an illusion. Although when nothing came out I should probably have wondered a little harder.