FILE - An activist smokes marijuana during the annual NYC Cannabis Parade & Rally. A study published in the Journal JAMA Psychiatry on Jan.
26, found that some regular cannabis users may be driving more impaired and for longer than they may think. "Participants’ increasing willingness to drive at 1 hour 30 minutes may indicate a false sense of driving safety.
Worse driving performance is evident for several hours post smoking in many users but appears to resolve by 4 hours 30 minutes in most individuals," according to the study’s authors.