Smoke

Smoke was a new updated in late 2009. It will release puffs of smoke into the air. This update was created by renderman. Smoke can be used as:
 * Jet fighter exhaust
 * Smoldering tire fires
 * Hot chocolate steam
 * Signal flares
 * Smoke grenades
 * Kitchen catastrophes
 * Acursed zombie hazetrails
 * Ghosts
 * Tail pipes of race cars and trucks
 * BBQs

The properties are smoke are:

Color – Quite simple. The color of the smoke.

Enabled – If checked, the smoke is “on”. If unchecked, the smoke is “off”. This can be a useful property for scripters.

Opacity – The “thickness” of the smoke. 0 is clear, 1 is completely solid.

RiseVelocity – The velocity of the particles along the Y-axis (up/down). 0 means the smoke hovers and is good for fog. A high number would be good for a signal fire. A negative number can be used to create spooky mist effect.

Size – The size of the particles. Huge particles will slow down old computers.