Think Tank™ is not a drug or chemical, it's an all-natural way to boost memory and focus. It combines 95% pure oxygen with organic rosemary aroma. Rosemary aroma has been independently studied and found to increase short term memory up to 75%. Just a few deep breaths can help boost and clear the cobwebs and maintain focus. Lightweight canister holds up to 10 liters, up to 200 inhalations.