Imagine if you were locked in an air-tight shack with enough food, water, nutrients, lighters, blunts/wraps/cigs, and a pot plant in soil. You could basically survive it if you had alot of soil. You could not run out of oxygen since the plants convert CO2 to O2, You could urinate in the soil for nitrogen, then poop in other soil as fert. Then you could smoke all the blunts you want as long as you keep your plants alive. If they die, you die. It is like the growers ultimate challenge.