I really don't want to say anything about smoking and health...
La verdad es que no quiero decir nada...
It all depends really on what you think...
Todo depende de lo que crees/creas...
I haven't the faintest idea about the environment and all that stuff...(inf)
No tengo la menor idea...
I'm really not interested in Sra. Sánchez's opinion about...
Realmente no me interesa...
I couldn't give two hoots about Pedro's plan for world peace...(inf)
Me importa un bledo...
I have no particular views on the matter of dumping toxic waste at sea...
No tengo un punto de vista...
I would rather not comment on the matter of the educational system...suffice to say...
Prefiero no comentar sobre el tema...
I should prefer not to comment on the first part of Rebecca's letter...
Prefiero no comentar...