I think its fair to say that the body's tolerance of cellulose spray and its solvents is different to Isocyanate's.
There are also people who have died of lung cancer at an early age due to smoking, also life long smokers who have lived to old age. But not many people who have lived after exposure to Isocyonates without protective measures.
COPD is the most common after effect in the long term. That is a horrible end...