To some, the idea of an appliance or a car getting connected to the Internet is as strange as the idea of a phone without physical keys was back in the day. It holds the promise of a future still unimaginable to the common folk, but one with nearly unlimited potential. Unfortunately, it also holds unprecedented danger: danger that could go far beyond the risk of smartphones or computers getting hacked. Because although it is terrible, and inconvenient, when online accounts and sensitive data get pilfered, the effects are still predominantly in the digital world.
When the Internet of Things goes bad, the danger to human lives becomes even more real.
Source: The Internet of Things will always be vulnerable | SlashGear