They can be disconnected from the net
A publicly-funded group of designers, artists and privacy experts from Amsterdam have designed an intelligent home system prototype to "prove it's technically possible to build a privacy respecting smart home while maintaining convenience".
IoT throws everything down the pan
Bog standard research from hardware security company nCipher suggests that IT security professionals are rather insecure about IoT and are becoming worried that even their toilets are leaking secret information.
Sharing too much data
A study in the British Medical Journal that looked at 24 of the 100s of medical apps available on Google Play found that 79 percent pass all sorts of user info -- including sensitive medical info like your reported symptoms are and which medications you are taking in some cases -- on to third and fourth parties