How far away from a smoker should I stand to protect myself from secondhand smoke?

How far away from a smoker should I stand to protect myself from secondhand smoke?

When someone is smoking in a closed space where air is not blowing, and that smoke, as it dissipates in the gas of the room, gets to where you can smell it at all, then you're at risk for consequences of that gas particle phase. You may not have as much of the toxic effect, you may have very minimal nicotine effects, but you will still have the gaseous effect that can increase eye irritation, nose irritation, congestion, sinusitis, sore throat, and so on. Your airways are going to be affected if you can detect it at all, if you have a good sense of smell. If you don't have a good sense of smell, stand further away. If your nose can detect the scent of gas, it's not safe. If you're out of doors, than stay upwind. Don't stay downwind of a smoker. If you can see smoke, don't walk through it. Cigarette smoke from someone else is not safe to you. Even in 30 seconds we know, 30 seconds of concentrated second-hand smoke can put someone at risk of a heart attack, who has predisposition for that. That is a finding released by the Center for Disease Control two years ago, and should put us all on alert that if we don't want to have an unexpected consequence of second-hand smoke, we just need to avoid it.