Smoky quartz is a stone of focused energy. It is protective, but it is more about being solidly embodied. When you are solidly in your body it is far less likely that anything outside of you can disturb your flow.
With elestials, there is a depth that can assist you in looking at an issue from many different angles in order to reach what is true for you.
The smoky elestial is a powerful stone, use it with intention.