Oracle PL/SQL - Are NO_DATA_FOUND Exceptions bad for stored procedure performance?

SELECT COUNT(*) INTO var WHERE condition;
IF var > 0 THEN
   SELECT NEEDED_FIELD INTO otherVar WHERE condition;
....

SELECT NEEDED_FIELD INTO var WHERE condition;
EXCEPTION
WHEN NO_DATA_FOUND
....

SQL>create table t (NEEDED_FIELD number, COND number);

SQL>insert into t (NEEDED_FIELD, cond) values (1, 0);

declare
  otherVar  number;
  cnt number;
begin
  for i in 1 .. 50000 loop
     select count(*) into cnt from t where cond = 1;

     if (cnt = 1) then
       select NEEDED_FIELD INTO otherVar from t where cond = 1;
     else
       otherVar := 0;
     end if;
   end loop;
end;
/

declare
  otherVar  number;
begin
  for i in 1 .. 50000 loop
     begin
       select NEEDED_FIELD INTO otherVar from t where cond = 1;
     exception
       when no_data_found then
         otherVar := 0;
     end;
   end loop;
end;
/

DECLARE
  CURSOR foo_cur IS
    SELECT NEEDED_FIELD WHERE condition ;
BEGIN
  FOR foo_rec IN foo_cur LOOP
     ...
  END LOOP;
EXCEPTION
  WHEN OTHERS THEN
    RAISE;
END ;

DECLARE
BEGIN
  FOR foo_rec IN (SELECT NEEDED_FIELD WHERE condition) LOOP
     ...
  END LOOP;
EXCEPTION
  WHEN OTHERS THEN
    RAISE;
END ;

SELECT MAX(column)
  INTO var
  FROM table
 WHERE conditions;

IF var IS NOT NULL
THEN ...

BEGIN
    FOR rec IN (SELECT a.needed_field,b.other_field
                  FROM table1 a
                  LEFT OUTER JOIN table2 b
                    ON a.needed_field = b.condition_field
                 WHERE a.column = ???)
    LOOP
       IF rec.other_field IS NOT NULL THEN
         -- whatever processing needs to be done to other_field
       END IF;
    END LOOP;
END;

begin
  for i in 2 .. 10000 loop
    insert into t (NEEDED_FIELD, cond) values (i, 10);
  end loop;
end;

declare
  otherVar  number;
  cnt number;
begin
  for i in 1 .. 5000 loop
     select count(*) into cnt from t where cond = 0;

     if (cnt = 1) then
       select NEEDED_FIELD INTO otherVar from t where cond = 0;
     else
       otherVar := 0;
     end if;
   end loop;
end;
/

PL/SQL procedure successfully completed.

Elapsed: 00:00:04.34

declare
  otherVar  number;
begin
  for i in 1 .. 5000 loop
     begin
       select NEEDED_FIELD INTO otherVar from t where cond = 0;
     exception
       when no_data_found then
         otherVar := 0;
     end;
   end loop;
end;
/

PL/SQL procedure successfully completed.

Elapsed: 00:00:02.10

SELECT NEEDED_FIELD INTO var WHERE condition;
EXCEPTION
WHEN NO_DATA_FOUND....

EXCEPTION
  WHEN OTHERS THEN
    RAISE;

DECLARE
  CURSOR foo_cur IS
    SELECT NEEDED_FIELD WHERE condition ;
BEGIN
  OPEN foo_cur;
  FETCH foo_cur INTO foo_rec;
  IF foo_cur%FOUND THEN
     ...
  END IF;
  CLOSE foo_cur;
EXCEPTION
  WHEN OTHERS THEN
    CLOSE foo_cur;
    RAISE;
END ;

DECLARE CURSOR loopCursor IS SELECT NEEDED_FIELD FROM TABLE WHERE condition;
        CURSOR condition1Cursor(p_parm TABLE.NEEDED_FIELD%TYPE) IS
               SELECT OTHER_FIELD INTO workVar FROM TABLE
                      WHERE condition_field = p_parm;
BEGIN
    FOR thisIteration IN loopCursor LOOP
       OPEN condition1Cursor(thisIteration.NEEDED_FIELD);
       FETCH condition1Cursor INTO testVar;
       IF condition1Cursor%FOUND THEN
       ....
       END IF;
    END LOOP;
END;

declare
cursor cur_name is  select * from emp;
begin
for cur_rec in cur_name Loop
    dbms_output.put_line(cur_rec.ename);
end loop;
End ;

declare
cursor cur_name is  select * from emp;
cur_rec emp%rowtype;
begin
Open cur_name;
Loop
Fetch cur_name into  Cur_rec;
   Exit when cur_name%notfound;
    dbms_output.put_line(cur_rec.ename);
end loop;
Close cur_name;
End ;

declare
  otherVar  number;
begin
  for i in 1 .. 5000 loop
     begin
       for foo_rec in (select NEEDED_FIELD from t where cond = 0) loop
         otherVar := foo_rec.NEEDED_FIELD;
       end loop;
       otherVar := 0;
     end;
   end loop;
end;