Hello
You mentioned that your brother is spiting blood and and also bleeding from mouth after the use of hard stuff in bars and also used weed .
These symptoms may be due to these reasons , these include.
1
Hemoptysis i.e. blood intermingled with spit or due to cough with expectoration is known as hemoptysis. Most common cause in your brother case may be due to
tuberculosis . Diagnosis can be confirmed by
X ray chest as well sputum examination , blood examination for C BC , E S R .
2
Hematemesis , if blood is from the stomach through mouth we call it hemetemesis . In your brother case this may be the one such reason because of
acute gastritis or gastric ulcer . Diagnosis can be confirmed by
ENdoscopy .
3 Blood dyscrasia is another such cause . But in your brother case deal as I mentioned above for reason no 1 & 2 .
However there are so many other reasons of such cases but you didn't mention complete history.
So in my opinion
consult a pulmonologist and get his opinion at earliest . Because blood fro mouth ( from lung or stomach ) is concerning .
Good luck.