Here’s a 
post I made a while ago in a somewhat related thread. (It was claimed that DMT crystal shape changes the nature of the experience.) Here’s the list I included in that post:
Factors Influencing a DMT Experience·	size of dose (how accurate is your scale?)
·	substrate used (copper mesh, liquid pad, herbs, ash, screens)
·	quantity/thickness of substrate (thick disc, thin disc)
·	degree of contact between substrate and sidewalls
·	porosity and uniformity of substrate
·	distribution of DMT on substrate (evenly distributed, piled in one area)
·	physical state of DMT on substrate (solid, liquid)
·	presence/absence of DMT residue on substrate from previous uses
·	presence/absence of DMT condensate on glass from previous uses
·	presence/absence of DMT impurities (oils, plant material, solvent traces, oxide)
·	nature of DMT solid state (fine powder, fluffy, granular)
·	DMT crystalline structure
·	number of inhalations to consume full dose (1, 2, 3 or more?)
·	rate of inhalation (slow and gentle, fast)
·	breathing immediately prior to inhalation (deep breaths?)
·	depth of inhalation (how deeply did you inhale)
·	holding time – how long is dose held in lungs?
·	rate of exhalation
·	total time taken to consume full dose
·	type of lighter used (“Bic”-type, butane jet/torch)
·	degree of pre-heating of ceramic filter (none, some, glowing red)
·	distance flame is held from ceramic filter
·	angle of flame (is it striking glass sidewalls?)
·	lighter movement (held stationary, moved around, up/down, etc.)
·	temperature of GVG (colder glass = more condensation = less consumed)
·	familiar vs. unfamiliar setting
·	indoors vs. outdoors
·	preparation of setting (is setting clean, orderly, pleasant?)
·	comfort level of setting (comfortable place to sit or lie down?)
·	music vs. no music
·	type of music
·	volume of music
·	presence/absence of distracting sounds (traffic, noisy neighbors, barking dogs, etc.)
·	presence/absence of other people
·	number of other people present
·	degree of familiarity with other people present
·	degree of sobriety of other people present
·	degree of experience with DMT/other psychedelics of other people present
·	light level (dark, dim, bright)
·	ambient temperature and other environmental factors (humid?, windy?, stormy?)
·	various other setting factors (doing it in a hot tub?, in a shower?)
·	anxiety level immediately prior to consuming dose
·	baseline psychological factors (are you generally anxious, depressed, happy, relaxed?)
·	degree of experience with DMT
·	nature of prior psychedelic experiences
·	nature of pre-DMT ritual (if any)
·	general physical state (energized, tired, aches and pains?, illness present?)
·	general psychological state immediately prior to consuming dose
·	physical/mental activities prior to consuming dose (long day at work?, walk in a park?, fight with spouse?)
·	presence/absence of other drugs in system
·	time of last DMT dose (30 minutes, 1 hour, 1 week?)
·	presence/absence of foods in system that affect experience (MAOI-containing foods?)
·	expectations regarding experience
·	beliefs regarding the nature of DMT experiences
·	physiological state (blood-sugar level, hormone levels)
gibran2 is a fictional character. Any resemblance to anyone living or dead is purely coincidental.