I have NEVER had that happen. You know why I think this is? I am in my mid 40's. My mother has been dead for close to 25 years and I am completely independent from and more than somewhat estranged from my father.
Again, I point to the pre and subconscious realms. Your conscious mind might be in perfect agreement and have congruent beliefs to your actions (smoking DMT) but maybe, just maybe some deeper level of your mind does not. I am no therapist, so this is JUST pure speculation.
But, seriously, consider all the anti-drug CRAP you were exposed to, all the blatant propaganda for YEARS. You probably got some from your parent(s), maybe from your religious leaders, maybe from your doctors and/or counselors, definately from your schooling and definately frequently when you turn on non-entertainment television or attend movie entertainments.
You may be a strong willed, independent thinking, grown man right now, but do NOT fool yourself into believing that all of that CRAP didn't have some sort of impact, didn't sink in to some level.
One thing DMT does for me is it points the way, it shines a very BRIGHT light on what I need to work on. I've had trips that have shown me what I have done wrong in my life, how I have mistreated people and what I should do to try to heal the past and prevent such things from happening in the future. These were some of the most brutal and harrowing experiences of my entire life. I came out of them shell-shocked, feeling violated, swearing I was done, at least for a few months, etc. Again, speaking personally, I do not find working with DMT to be easy, but I do find it to be incredibly valuable and an effective catalyst for personal insight and growth.
If any of my personal stuff might be at all applicable to you, maybe looking at issues of guilt or propaganda that have penetrated below the surface might be a way to go.
Again, I stress that these are strictly intuitive statements based on MY personal experience and work with DMT. I am NOT a counselor. If you choose to work or focus on your deeper material, whatever it may be (and don't think I've identified it - I'm just pulling stuff out of my rear here) and find the work to be disturbing, I sincerely recommend seeking the services of a therapist, possibly even one who specializes in transpersonal work.
Peace & Love