Major Filling a space pod with plasma instantly kills whoever steps foot in it.

Code:
(proc/handle_breath(datum/gas_mixture/breath))

var/breath_pressure = (breath.total_moles()*R_IDEAL_GAS_EQUATION*breath.temperature)/BREATH_VOLUME



// Partial pressure of the O2 in our breath

var/O2_pp = (breath.oxygen/breath.total_moles())*breath_pressure

// Same, but for the toxins

var/Toxins_pp = (breath.toxins/breath.total_moles())*breath_pressure



if (O2_pp < safe_oxygen_min) // 17

    // Not enough O2!

    if (O2_pp > 0)

        // But some, at least

        // (17 / effective-oxygen-percent) * 5 damage

        // BUG? This is backwards! Number *increases* as oxygen decreases...

        // Should be (O2_pp / safe_oxygen_min)!

        var/ratio = round( safe_oxygen_min / (O2_pp + 0.1) )



        // Due to bug, "ratio" will always be > 1

        // so 5 * ratio is always > 5!

        // Effectively, this means you always take 5 OXY damage. Welp!

        // Pretty sure this bug is still in the game since I always see people with OXY in increments of 5.

        // Huh.

        take_oxygen_deprivation( min( 5 * ratio, 5 ) )

        oxygen_used = breath.oxygen*ratio/6



[...]



if (Toxins_pp > safe_toxins_max) // 0.4

    // Partial percent of toxins > limit. That's too much!

    // Note that unlike the above, this ratio isn't backwards...

    // but it uses the actual amount of moles, not the partial percent!

    // Effectively, the actual amount of toxins decides the damage, not the %,

    // but you need at least 0.4% to start taking damage.

    // Wonder if super-chilled plasma (lower pressure but higher mole count?)

    // would insta-kill due to this

    var/ratio = breath.toxins/safe_toxins_max



    // BUG: take_toxin_damage doesn't take a second parameter.

    // Was this supposed to be min( 325 * ratio, 15 ) like oxy?

    // (If so you'd cap at 15 damage per tick rather than dying instantly)

    take_toxin_damage(ratio * 325,15)