I am not sure I understand this need for air control valves and such to get a direct lung hit...
Seems to me, I use a protank 2... and all I do is not apply so much pressure with my upper lip -- let some air in during the toke and I can control the air intake easy enough by adjusting my upper lip....more air? - raise upper lip slightly... less air, tighten upper lip.
Why again would I need a knob to turn? When I do it the way I described above, the vapor goes directly into my lungs?
What am I missing here?
Seems to me, I use a protank 2... and all I do is not apply so much pressure with my upper lip -- let some air in during the toke and I can control the air intake easy enough by adjusting my upper lip....more air? - raise upper lip slightly... less air, tighten upper lip.
Why again would I need a knob to turn? When I do it the way I described above, the vapor goes directly into my lungs?
What am I missing here?