does this gas put people at any risk?
Yes, explosions caused by natural gas leaks can occur also it produce  carbon monoxide which is harmful
Natural gas
Natural gas heating systems may cause carbon monoxide poisoning if unvented or poorly vented
where does the world's helium come from Most helium in the universe is helium-4, the vast majority of which was formed during the Big Bang what is helium? It  is a chemical element with the symbol He and atomic number 2 who was the first to discover this element? It was first detected  by Georges Rayet, Captain C. T. Haig, Norman R. Pogson, and Lieutenant John Herschel, and was subsequently confirmed by French astronomer, Jules Janssen where is this first person from? Georges-Antoine-Pons Rayet was a French astronomer is there anything else that he has discovered apart from the element? Yes, he discovered Wolf–Rayet stars together with Charles Wolf where can this chemical element be extracted from? Natural gas can you tell me some domestic uses of this type of gas? Natural gas can be useful in domestic cooking and heating fuel
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Natural gas [SEP] Risk of carbon monoxide inhalation
Natural gas heating systems may cause carbon monoxide poisoning if unvented or poorly vented. In 2011, natural gas furnaces, space heaters, water heaters and stoves were blamed for 11 carbon monoxide deaths in the US. Another 22 deaths were attributed to appliances running on liquified petroleum gas, and 17 deaths on gas of unspecified type. Improvements in natural gas furnace designs have greatly reduced CO poisoning concerns. Detectors are also available that warn of carbon monoxide and/or explosive gas (methane, propane, etc.).