Is it normal for dreams to signifantly impact real life?

Both me and my brother have been impacted by dreams, him more than me though. I tend to have extremely vivid dreams yet often they aren't lucid so I don't realise it's a dream untill i wake, that can be depressing for me as I tend to dream a lot about people I used to know and times I miss, so often I'll be with someone I knew or ocassionally who's died, sometimes I'll resolve situations or get chances to say goodbye's then I wake up and feel awful. Sometimes A dream about something i'm exited for can put me in a good mood though. My brother Stopped smoking because of a dream, he doesn't have vivid dreams often which made it more powerful. He had come in from a fag and started coughing, it got worse and he coughed up blood and couldn't breath, he said he ended up vomiting blood. That was 2 years ago and he hasn't smoked since