Trichlorofluoromethane is only slightly toxic when inhaled. Progressive effects from acute inhalation can include rapid and irregular respiration, increased activity, tremors, uncoordinated body movements, and loss of consciousness.
                                            -- Environmental Health Perspectives, Volume 102, Number 9, September 1994

The following information is from Boc Gases:

Hazards Identification

Emergency Overview
This product does not contain oxygen and may cause asphyxia if released in a confined area.
Chlorofluorocarbons can cause irritation, central nervous system depression and irregular heart beat at high concentrations. Nonflammable but decomposes to toxic gases, including phosgene, under fire conditions.

Eye Effects
Persons with potential exposure should not wear contact lenses. Contact may cause tissue damage and cryogenic burns similar to skin contact. Seek medical treatment as soon as possible.

Skin Effects
Contact with the rapidly evaporating liquid may cause frostbite. Frostbite effects appear as a change in color of the skin to grey or white, possibly followed by blistering.

Ingestion Effects
Ingestion is not likely.  (Unless it's poured into the tobacco product you're using.)

Inhalation Effects
Product is relatively nontoxic. CFCs can irritate the eyes, mucous membranes and respiratory system.
Inhalation of high concentrations may cause dizziness, disorientation, incoordination, narcosis, nausea or vomiting leading to unconsciousness.. At high concentrations narcotic effects may be produced and may cause the heart to beat irregularly and stop.

Oxygen deficiency may occur in the presence of high concentrations resulting in asphyxiation. Maintain oxygen levels above 19.5% at sea level. Effects of oxygen deficiency resulting from simple asphyxiants may include: rapid breathing, diminished mental alertness, impaired muscular coordination, faulty judgement, depression of all sensations, emotional instability, and fatigue. As asphyxiation progresses, nausea, vomiting, prostration, and loss of consciousness may result, eventually leading to convulsions, coma, and death.

Oxygen deficiency during pregnancy has produced developmental abnormalities in humans and experimental animals.

Medical Conditions Aggravated By Exposure
Pre-existing heart condition.

First Aid Measures

Eyes
Never introduce ointment or oil into the eyes without medical advice! If pain is present, refer the victim to an opthalmologist for treatment and follow up. If the victim cannot tolerate light, protect the eyes with a light bandage.

Skin
Remove contaminated clothing and flush affected areas with lukewarm water. If irritation persists, seek medical attention.

Ingestion
None anticipated. Product is a gas.

Inhalation
PROMPT MEDICAL ATTENTION IS MANDATORY IN ALL CASES OF OVEREXPOSURE. RESCUE PERSONNEL SHOULD BE EQUIPPED WITH SELF-CONTAINED BREATHING APPARATUS. Remove victim to fresh air. Administer artificial respiration if breathing has stopped and supplement with oxygen by a trained individual. Further treatment should be symptomatic and supportive. Seek medical attention as soon as possible for follow up treatment. Remove to fresh air. If necessary, give oxygen or provide artificial respiration. Call a physician.

NOTE TO PHYSICIAN: A patient adversely affected by exposure to this product should not be given adrenalin (epinephrine) or similar heart stimulant since these would increase the risk of cardiac arrhythmias.

Fire Fighting Measures

Fire and Explosion Hazards
If involved in a fire, product may decompose yielding toxic products, which may include phosgene, hydrochloric and hydrofluoric acids.

Extinguishing Media
None required. Use media appropriate for surrounding flammable substances.

Fire Fighting Instructions
Positive-pressure, self-contained respiratory equipment for fires involving large quantities of this material.

Accidental Release Measures

Evacuate all personnel from affected area. Use appropriate protective equipment. If leak is in user’s equipment, be certain to purge piping with inert gas prior to attempting repairs. If leak is in container or container valve, contact the appropriate emergency telephone number listed in Section 1 or call your closest BOC location.

Handling and Storage

Product is noncorrosive and may be used with any common structural material. Silver and carbon bearing alloys can act as catalysts for decomposing the product at high temperatures. Alloys containing more than 2% magnesium should not be used if water is present.

Use only in well-ventilated areas. Valve protection caps must remain in place unless container is secured with valve outlet piped to use point. Do not drag, slide or roll cylinders. Use a suitable hand truck for cylinder movement. Use a pressure reducing regulator when connecting cylinder to lower pressure (<150 psig) piping or systems. Do not heat cylinder by any means to increase the discharge rate of product from the cylinder. Use a check valve or trap in the discharge line to prevent hazardous back flow into the cylinder. Protect cylinders from physical damage.

Store in cool, dry, well-ventilated area of non-combustible construction away from heavily trafficked areas and emergency exits. Do not allow the temperature where cylinders are stored to exceed 125oF (52oC). Cylinders should be stored upright and firmly secured to prevent falling or being knocked over. Full and empty cylinders should be segregated. Use a "first in-first out" inventory system to prevent full cylinders being stored for excessive periods of time. For additional handling recommendations, consult Compressed Gas Association Pamphlet P-1. Handle with reasonable care. Store in a cool, dry place.

Never carry a compressed gas cylinder or a container of a gas in cryogenic liquid form in an enclosed space such as a car trunk, van or station wagon. A leak can result in a fire, explosion, asphyxiation or a toxic exposure.

Exposure Controls, Personal Protection

Engineering Controls
Hood with forced ventilation; provide local exhaust to prevent accumulation above the exposure limit.

Eye/Face Protection
Chemical splash goggles or face shield recommended to prevent contact with cryogenic liquid.

Skin Protection
Neoprene rubber gloves. If contact with the liquid phase may occur, gloves should provide sufficient insulation to protect against frostbite and cold burns.

Respiratory Protection
A Type C respirator with full-face piece equipped with an escape bottle or a self-contained breathing apparatus should be available for emergency use. Operate this equipment in the positive pressure demand mode.

Other/General Protection
Safety shoes, eyewash "fountain."

Stability and Reactivity

Stability
Stable

Incompatible Materials
May react violently with chemically active metals such as sodium, potassium and barium, powdered magnesium, powdered aluminum and organometallics.

Hazardous Decomposition Products
Decomposes at fire temperatures to hydrochloric and hydrofluoric acids, carbonyl fluoride and phosgene.