pakalolo said:
If your LB passes the test then I think OF covered it pretty well. Probably you need to wait longer before hitting it. Wait until you can see the vapour escaping from the draw hole or clouding the screen
Excellent point, I'd forgotten those useful visual clues. With
fresh herb in the trench you should be able to look through the window (without inhale) and see 'frosting' form on the surface, then just suck it out. You can do this a time or two if the herb is fresh, very dry bud doesn't do it as much. Likewise, look into the exhaust hole (down the stem if installed) at the bulb inside while holding it flat. You should see a tiny 'fog bank' form down there, suck it out and watch the next bit form up.
It's also useful to exhale into strong side light (sunlight or a desk lamp for instance) against a dark background. Makes the vapor much easier to see. Remember, it doesn't take much vapor to do the job because there's no useless (and dangerous) junk in there with it.
Also consider huffing that junk (poison really when you get down to it) will give you a buzz on it's own, no THC really needed....not really what we're after though.
OF
Edit: spelling correction....a real corker....