That's the only reason I use psychadelics is to have a so called "bad" trip.
That's one of the most important things I learned first in zen meditation practice, but really anchored in my body with ayahuasca that there is no such thing as bad/good. Things just are what they are. I learned to give up good/bad value judgments on my experience and especially emotions. Labeling the pain or terror as negative and bad is just resistance to it and a way to create suffering.
Psychadelics open up the gates of the unconscious mind and can bring you into contact with repressed pain and emotions from childhood and birth. A lot of the experience may be a symbolic projection of these repressed emotions of fear, terror, impending doom, death, shame, rejection. Also you may experience the projection of early memories of selflessness, oneness and pure love(or hell) and merging with the mother, while you were in the womb of your mother before you had an ego.
Feeling and integrating these repressed emotions is very healing, but can be challenging. The more we feel them the less we need ego defenses and dysfunctional habits to avoid feeling these emotions.
One of my guides(a psychotherapist and shaman) once told me in ceremony, "Would you rather have a bad trip, or a bad life?" And therein lies the reason for using these substances. We let these energies and emotions play out in the dreamworld in one big concentrated dose, so they don't play out subtly for the rest of our lives.
Embrace whatever is happening. What you resist persists, what you feel, heals. There's a zen saying. Pain * resistance = suffering. You create your own suffering by resisting the pain. I have gotten so much liberation from surrendering to what I would have normally considered "horrible" experiences on ayahuasca. I live for it now, and it helps me embrace the pain of day to day living and dramatically helps my meditation practice.
I think it's important to stay in your body and pay attention to how you're feeling and just be OK with feeling that.
I have never done smoked DMT(aside from 5-meo), so I can't speak to that. I've only used ayahuasca. But ayahuasca contains DMT. One of my teachers, (that I mentioned earlier) told me that he's tried smoked DMT and he thinks it's a waste. He calls it psychadelic crack that's just confusing and unintegratable and says it does not have much healing properties and it's mainly just for thrill seekers and space cadets. I may try it one day to see for myself but I'm in this for psychotherapy and healing not for recreation or avoiding reality.
Here's a quote from Timothy Leary in his book The Psychadelic Experiences, an interpretation of the tibetan book of the dead. This is designed to be read by a guide to someone going who is facing their demons during an LSD trip.
I find the Tibetan Book of the Dead a great guide to the ayahuasca experience.
O nobly born, listen carefully:
You were unable to maintain the perfect Clear Light of the First Bardo.
Or the serene peaceful visions of the Second.
You are now entering Second Bardo nightmares.
Recognize them.
They are your own thought-forms made visible and audible.
They are products of your own mind with its back to the wall.
They indicate that you are close to liberation.
Do not fear them.
No harm can come to you from these hallucinations.
They are your own thoughts in frightening aspect.
They are old friends.
Welcome them. Merge with them. Join them.
Lose yourself in them.
They are yours.
Whatever you see, no matter how strange and terrifying,
Remember above all that it comes from within you.
Hold onto that knowledge.
As soon as you recognize that, you will obtain liberation.
If you do not recognize them,
Torture and punishment will ensue.
But these too are but the radiances of your own intellect.
They are immaterial.
Voidness cannot injure voidness.
None of the peaceful or wrathful visions,
Blood-drinking demons, machines, monsters, or devils,
Exist in reality
Only within your skull.
This will dissipate your fear. Remember it well.
http://www.near-death.com/experiences/buddhism03.html - from the tibetan book of the dead: a guide to the death experience.
There will be peaceful spiritual entities that emanate from our heart and wrathful ones that emerge from our brain.
They will appear one by one and then all together. The peaceful spiritual entities are complete and immovable. If we cannot bear to enter their vast benevolent space, if we cannot let go of self-centeredness and fear, these deities will become terrifying wrathful ones. If we recognize them as an expression of our own mind, they are the unsparing face of wakefulness.
The wrathful forms emerging from the brain appear before us actually and clearly as if they were real in their own right. The terror and anger we feel are our own efforts to evade from being completely awake. We wander uncertainly in the landscape of our own mind. If we recognize this as our own projections, liberation is instantaneous.
These wrathful forms are the presence of our innate wisdom, the vivid form of our own wakefulness. We must recognize them as a reflection of our own mind. Recognition and liberation are simultaneous.
