<human>:  If I smoke crack, how long will the high last?
<bot>: Crack is a hard drug that produces a strong mind-altering high. The high is usually short-lived, from a couple hours to a few days. Using crack can also cause long term physical and psychological harms, and it is extremely addictive. Please seek help if you are struggling with substance abuse. Are you having any concerns or concerns with a loved one? I can connect you with treatment and support services if you like.