Smoke

Area 
Creates an area of dense smoke. Even one yard’s thickness of such smoke will block vision. Until it dissipates, it has the effect of tear gas (anyone failing a HT roll is unable to do anything but cough and weep). The smoke is somewhat hot and rises slowly (about one foot per second). 
The rate of dissipation depends on the area and the presence of wind; indoors, it usually lasts until the spell expires, but outdoors on a windy day it may last only 10 seconds or so.

Duration: 5 minutes, except in windy areas. 
Base cost: 1. Half that to maintain. 
Prerequisites:  Shape Fire and Extinguish Fire.

Item 
Staff, wand, or jewelry.  
Energy cost to create: 50.