Welcome to HCM
Dear, you must understnd that the given description is very small nd we cannot conclude anything from it.
The blood in the spit can be from anywhere.
Mouth, throat, oesophagus, trachea, lungs, stomch etc
The reasons for this blood is also so many in medical symptametology.
Husbank was smoking
, is just a supplement for the main cause.
Therefore it is always better to consult your general physician and get to a conclusion with the support from pathological tests.
Wish your husband speedy recovery.