There are a few different ways to create a smoky effect using Photoshop. One of the easiest ways is to use a smoke brush.

To create a smoky effect using a smoke brush, follow these steps:

1. Open your photo in Photoshop.
2. Create a new layer.
3. Select the Brush tool from the toolbar.
4. Click on the brush preset selector and select a smoke brush.
5. Set the brush size and hardness to the desired values.
6. Paint on the new layer to create the smoky effect.
7. Once you are happy with the smoky effect, reduce the opacity of the layer to blend it with the background.