I found when i first tried DMT it was so harsh and unpleasant i felt like i has poisoned myself so much so that i didnt touch it again for years.   Then when getting back into it i knew what to expect and just delt with the discomfort which always lead to a milder experience because i could only take so much.. it also kept me from using it no more then 2 or 3 times a year.  Until recently when i was just trying to clean out an old machine that i came across.   The vapor was almost unnoticeable and i only took two decent sized hits. But they felt like nothing and i had the best DMT experience yet.   It wasnt till i came down that i realized all this time i had been burning it and making for a unpleasant weaker trip.  Since then ive been working on perfecting my technique. Good vaping skills makes a world of difference literally