You've got to remember that the entire point of setting fire to ganj in the first place is because the heat vaporizes and activates the THC for absorption through the lung tissue. As smoke cools the THC de-activates, or just precipitates onto whatever avalible surface is handy. This is why bong hits can go stale. And why holding smoke in until you're blue in the face has no additional benefit (and probably quite a bit of damage to the lungs). The time it takes for smoke to go stale is debated in some circles (or maybe just my own) but I can't imagine being able to carry around a bottle of it and having any desirable effects.

Listen to the poster who suggested tincture. A couple drops under the tongue and you could be flying...