If i smoked weed for the first time and i only took 4 hit and got high how long does a stay in my system for?

Marijuana can be found in blood tests up to 90 days later and hair samples up to 6 months. The more important question is what damage may have been done to your body. Smoking any substance can cause autoimmune reactions, fibrotic changes in lung tissue, impaired brain developement, increased stroke risk because of blood vessel changes, and psychosis/anxiety/depression.