How does marijuana stay in your body?

marijuana stays in your body longer then other drugs because

1. THC is stored in your fat cells even after you come down from your high

2. Marijuana is a natural substance and your body does not reject it like man made substances.

3. Marijuana residue is sticky and takes a long time to break down so when you inhale marijuana smoke the residue or THC resin sticks to your lungs and is broken down and released into the bloodstream at a slow pace.

there really isn't any big science behind it, THC is a lazy, euphoric substance and that's how it acts in your body.