It is perfectIy safe for others. Make sure you have all of the necessary equipment; bag, tubing, regulator and tape. The nitrogen is easily purchased and legal. The canister is small and could probably be carried in a tall knapsack or a small suitcase. Please be aware that those with lung conditions cannot use this method. Too much carbon dioxide remains in the lungs for successful completion. Asthma, emphysema (otherwise known as COPD) will nullify your efforts. Be careful with the regulator as well it must be a good fit for the tubing and maintain a steady stream of nitrogen at a given rate. There is a brewing company that sells and explains all the parts and several sites that tell you how to use them. The company is in Australia. Hope that you can get all the information you need but if not let us know and I shall see what else I can tell you. It is not wise to attempt filling a room with the gas. In the first place you would need far too much gas and in the second it is super fast and peaceful if the first inhalation is a big one, taken after all the air is exhaled from your lungs. Hope I have not overdone this. I am new here...blush.