Can benzos cause respiratory problems to those with no known copd?

You need to define: What you mean by respiratory problems. In sedative doses they will cause respiratory depression and should always be used with caution. It is not generally recommended that these drugs be used long term and in the event they, then the individual should have close frequent follow up with the prescribing physician.

Depends .: Benzos depress the respiration especially when taken in huge quantities causing respiratory arrest however, even a modest amount can cause respiratory depression in compromised lungs like copd.

In too high a dose: Benzodiazepines are vastly safer than barbiturates and barbiturate-like drugs because their activities stop at the upper part of the brain and do not, in therapeutic doses, extend to the respiratory centers in the midbrain. Together with alcohol, opiates, other depressant drugs, and in very high doses (or iv) they can and do cause problems, even without copd. Normally, in usual doses, they don't.