Hey, Locster. Sorry to hear you're feeling worried and uneasy in the chest. I always think it's a good idea for people who have any questions at all to visit their doctor for a checkup. Young people have heart trouble occasionally, and you might as well rule that out.

My hunch from what you wrote, though, is that you're having anxiety. Weed smoking can provoke that in plenty of people, and Sativa-heavy strains in particular can leave you feeling jittery and anxious, sometimes setting off full-blown panic attacks. You've also had some circumstantial things recently, like that car wreck, which would make it perfectly understandable for you to be experiencing some anxiety or depression after. (They often travel together, anxiety and depression.)

Here's the other thing, though, and it's back to the heart itself. For the first hour after weed smoking, your heart does experience stress in precisely the same way that someone who's had a strong vasoconstrictor medicine like epinephrine does. It's this soon-after-smoking adrenaline rush (adrenaline is your body's own epinephrine) that also causes the panic in many people, making your heart race and making you feel uneasy. Sometimes arrhythmias can show up during that time, and the sad truth is that within the first hour of smoking, people's heart attack risk is five times that of what it normally is. No one yet knows why that is, whether it's the smoking itself, the THC, other cannabinoids, or the tar and other irritants in the smoke, but it's been proven in several studies. Google "marijuana and heart attack" and you can read about this phenomenon.

Anyway, like I said, a visit to the doctor is probably in order just to be safe, and you might think about taking a weed break and seeing if that doesn't relieve your symptoms, too, and help you feel better. Take care, Locster!