2nd hand smoking

My husband, father & oldest brother out of 3 siblings ( me included) are smoking, my hubby doesn't smoke around me much knowing i'm pregnant due wanting to keep our baby healthy but my dad & oldest brother keep smoking in the house & it's hard to avoid inhaling the smoke even though i try my best to cover my nose as a second hand smoker when my brother decides to sit in the living room & smoke because i sleep there as i have no bedroom of my own.. so is it safe for me & baby to be in this kind of environment? what can i do to avoid inhaling smoke from cigarettes?#advicepls #firstpregnancy