An alternate solution could be to alter the flow of execution of your script by using the GOTO statement…
DECLARE @RunScript bit;
SET @RunScript = 0;
IF @RunScript != 1
BEGIN
RAISERROR ('Raise Error does not stop processing, so we will call GOTO to skip over the script', 1, 1);
GOTO Skipper -- This will skip over the script and go to Skipper
END
PRINT 'This is where your working script can go';
PRINT 'This is where your working script can go';
PRINT 'This is where your working script can go';
PRINT 'This is where your working script can go';
Skipper: -- Don't do nuttin!
Warning! The above sample was derived from an example I got from Merrill Aldrich. Before you implement the GOTO statement blindly, I recommend you read his tutorial on Flow control in T-SQL Scripts.