No risk at all! We insist, this is due to some almost standard characteristics of the gas fireplaces:
The first is the fact that gas fireplaces burn 100% of the fuel they are feed. No gas or smoke is released into the house.
The second is that there is safety backup support, a sensor that detects whether there may be any gas leakage. If an abnormality is detected, this mechanism is activated immediately.
The third is that gas fireplaces are equipped with a glass door that must be closed for operating. This effectively seals the gas chamber from the rest of the house. Thus, the air and particles are vented outside the house, free from any contact with the living area.