[roman]

Para debate:

Ya alguna vez se debatió acerca de esto y reafirmo mi opinión:

Las excepciones deben usarse para controlar errores que no podemos detectar a tiempo, no para cualquier cosa que un simple condicional previo nos evitaría.

Incluso la misma ayuda de Delphi dice:

Empezado por Ayuda de delphi

Conditional statements are often the best way to test for errors. For example, suppose you want to make sure that a file exists before trying to open it. You could do it this way:

Código Delphi [-]
try
  AssignFile(F, FileName);
  Reset(F);  // raises an EInOutError exception if file is not found
except
  on Exception do ...
end;

But you could also avoid the overhead of exception handling by using

Código Delphi [-]
if FileExists(FileName) then  // returns False if file is not found; raises no exception
begin
  AssignFile(F, FileName);
  Reset(F);
end;

// Saludos