Is Using Seroflow Inhaler Lifelong Safe?

Dear sir, i had allergy problems, wheezing sound from lungs and rubber like white flum forming at throat every 2 hours and causing breathing issues. have taken medication for 6 months and x-ray result showed am fine. but again after few months, i got exposed to dust, also i took cool drinks in an autumn season. Again am getting the same problem especially in early hours 3 to 4 A.M. with seroflow inhaler, am becoming fine. Should i continue using this inhaler lifelong??