I'm sorry to tell you this but my own experience was that raw lungs were a tasteless, wholly cartilaginous, difficult-to-chew-mess, taking ages to gulp down in the end. I had such difficulty with them and never detected any positive(or negative) effect from them that I stopped eating them c. 12 years ago. Same goes for raw testicles from large mammals. Maybe I might have been able to easily eat them if they had been aged for a long time, who knows?