hmmmm ,

Little late on this one but I can anwser your question.

Tripper is right , While being in the same Apartment while your friends are burning a half ounce will definatly get you a " contact high ".

Now If you begin to use the drug frequently you will know you were high that night.
You may not have known then because you may have never been high before.

Anwser these questions to your self:

1. Did you laugh at things that are not funny?
2. Did you eat more than you would normally eat?
3. Did you spend more time in front of the bathroom mirror than normal?
4. Did you at any time lose your sence of ballance or dirrection?
5. Did you discuss with enthusiam things that are not relivent to the conversation?

If you said yes to more than 3 , you got stoned.