For how many H per D were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location
for how many h per d were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location
For how many H per D were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location
for how many h per d were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location