All i'm saying is, Your lungs will only allow you to inhale a certain concentration. It's like any other inhalant, you concentrate and inhale the fumes. I can see the value in trying to understand the dosage but i have never seen anybody actually attempt to measure an inhalant like that. The only way to do too much is to take successive breaths without breaking for air, and the only way to do too little is not to do it. There's no way you can inhale that which is too much physically all in one breath, and mentally the drug itself has extremely dissociative, sensorial deprived qualities that last a couple minutes at best, so there's no potential for a scary trip or anything like that.