I don't think it was because of smoking. Could just be blood from coughing a lot, could have made your throat bleed a little, or if you had a little bit of a nose bleed and sucked up the blood without even knowing it was there. But you should watch it anyway, and if it happens again you should see a doctor. But it's probably nothing serious. It has happened to me where I coughed blood but it didn't happen again so I don't think it was anything bad.
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I used to smoke squares but not anymore. One time my friends let me smoke weed and just one hit and I was coughing like hell. But I don't know if you can cough up blood.
Coughing up blood is typically concerning. Go to the doctor please.
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Sometimes colds in the lungs will produce some blood. If this persists for more than 2 or 3 days and or there is a significant amount of blood go to the doctor asap.
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