This^^. I feel that doing it this way launches you harder rather than taking a few puffs. Their is no waste this way if you do it correctly. I just hold it in, not for a certain amount of time. Just hold it till you lose sight. You will automatically exhale and start breathing after you leave your body. I believe this ensure's you get your entire dose in your lungs AND absorb all of it.

I use a bulb meth pipe in an acrylic bong with a thumb carb. I use a butane torch a few inches away. My distance fluctuates according to how well it's vaping. Once you do it this way and have it down I believe you wouldn't do it any other way. It is so smooth it's sometimes hard to tell I am holding anything in my lungs at all lol.

If you don't heat it too much the oils won't vaporize and will be the only thing left. They Vape at a slightly different temp than dmt I believe.