How Long does weed stay in your system?

I had a friend come over he smokes weed. It smelled good I haven't smoked it in 20 years I took 2 drags and man it messed me up quick. 3 days later and I still have after taste some times ! When my mouth is dry its still there the residual taste and light headed. so how long till it passes? yehh im a light... show more I had a friend come over he smokes weed. It smelled good I haven't smoked it in 20 years I took 2 drags and man it messed me up quick. 3 days later and I still have after taste some times ! When my mouth is dry its still there the residual taste and light headed. so how long till it passes? yehh im a light weight just don't smoke any More.
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