[Link](Mouse over link to see full location)
I found this little paragraph that could be the answer to your question. Although, the doctor states that he is not absolutely 100% positive.
"I believe that the answer is that
marijuana (specifically, cannabinoids) produce vasodilation (increased
caliber of blood vessels)."
I'm sorry I couldn't find anything better for you, but if you want a better answer try going to www.ask.com and type in some keywords for your question & see if you can find anything else! Good luck!! ♥Jenn [ SmoothiesFknRock's advice column | Ask SmoothiesFknRock A Question ]
Brandi_S answered Friday January 19 2007, 7:12 pm: "Its irritating smoke dilates (enlarges) blood vessels. (It is not the smoke that dilates blood vessels, but the drug itself. This dilation of the blood vessels also causes the bloodshot eyes.) It also reddens the eyes and inflames the soft and delicate tissues of the nasal canal."
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.