Are you running in DCS or conventional? Like John said, if running DCS the smoke volume control does nothing, use the smoke button on the remote and follow the responses the remote gives you. Sounds operate similar, use the sound button.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .