All holding a hit in for 25-50 seconds will do is deprive you of oxygen, creating a placebo effect of getting higher.

A study done by a group of doctors in Canada at Dalhousie University, concluded that more than 90% of the THC is absorbed into the lungs within the first seconds of inhalation. Another study confirms this, but they put their number at 95% absorption. The 5-15% of THC that isn't absorbed is due to THC loss in trace smoke, or smoke that never enters the lungs.

Drug Detection Times @ Drug-Test-Facts.com - Keep practising, inhale correctly and deeply.

If this truly is Jack Herer, you should be laughing your ass off and be high as hell coz that strain is BOMB. Are there a lot of white crystals?