Please accept this Cyber Hug. I am so sorry for the tragic loss of your teen daughter. My sincere condolences to you and your entire family. There is a lot of misinformation (or lack thereof) about the dangers of huffing and how there is NO type of inhalant that is safer than the next. My friend has a Traumatic Brain Injury (TBI) from inhalant use at the age of 12, now in her 30s. The oxygen in the blood gets displaced by the inhaled gas or chemical vapors. People may not realize that the chemicals in products used for huffing are actual POISONS that were never meant to go through the bloodstream.
My thoughts and prayers for you, your husband, and entire family. How brilliant that you are taking a tragedy and helping to prevent others from such a dangerous and destructive behavior as huffing, which has also been referred to as "Chemical Russian roulette". I'm sure that your daughter is watching you from up above and is so proud that you're educating others about the dangers of huffing.
Just an fyi that the National Inhalant Prevention Coalition (NIPC) is having their 20th annual "Inhalants and Poisons Awareness Week" from March 18 - 24, 2012. Their website has more information about how to get a free education kit.
I just wanted to add the site for The Compassionate Friends which is a non-profit organization primarily for parents who are grieving the loss of a child, and perhaps there is a local support group to attend. (Other family members such as siblings, grandparents, aunts/uncles and cousins may attend the meeting, too.)