For how many Y were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location:Time:Pt:^Patient:Qn:PhenX
for how many y were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location:time:pt:^patient:qn:phenx
For how many years were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location [PhenX]
for how many years were you exposed to smoke from other peoples cigarettes or tobacco products during this time at this location [phenx]