What are the venomous effect of propane while inhaled?

My job I plague propane tanks for companys and be just wondering mete out I always discern light head after work.What are the venomous effect of propane while inhaled?
http://www.pmak.org/public/propane_facts...
Here's an exerpt:
Propane is nontoxic and not harmful to breathe contained by small concentrations. However, breathing large concentrations may result surrounded by suffocation. Inhaling propane vapor may produce dizziness, loss of coordination, unconsciousness or departure.
I suggest you fill upwind! Hazards of the livelihood, I suppose. Is your equipment in virtuous working order - no leak?
Propane is non-toxic, When you feel lighting headed it is because that when you breath the juice not vapor, it displaces the o2 in your lungs. I enjoy worked for a propane plant for 2 years and have breathed contained by alot of propane, but it is non-toxic just dont breath surrounded by too much at one time or you will pass out from removal of o2
Cylinder Safety
Propane cylinders are safe, as long as they are handle properly and ignition sources are controlled. This module explains when cylinders must be inspected, describes what to look for when inspecting a cylinder, and explains what to do with a rejected cylinder. Cylinders may with the sole purpose be filled if they are contained by compliance with DOT specifications.
it can effect a drownding effect & kill brain cell because it evaporates at lower atmosphereic levels so if you fiction down on your back & breath deaply you should know how to expel it easily .

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