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 hours per day were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location
for how many hours per day were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location