I don't believe in ghosts as such....my Grandad was a grave digger and used to have to dig graves in the middle of the night for early morning funerals and he always said to us "you should never fear the dead, its the living who'll hurt you". Before he died he told me he would come back and let mw know if there was anything "on the other side". I spent the first 6 months after he died barely sleeping in case I woke up to him sat on the end of my bed
After he died though, there was sometimes a smell of cigarette smoke in the house - none of us smoked but he used to when he came to stay with us. I've smelt my mums perfume too but I don't know whether thats just wishful thinking