Depends : Marijuana "highs" can last variable lengths of time, especially in new or naive users. The synthetic cannabinoids (spice, k2) can sometimes last longer, and severals days and longer are not unusual. If you are feeling paranoid, very anxious, or are feeling unsafe in any way, i would consider contacting your family physician or going to an urgent care setting. Otherwise, it will resolve on own.
Answered 1/3/2013
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