Quick question. You said you "never experienced asthma in the summer" ... Does this mean that you have asthma? If so, (I don't personally have asthma, btw) I would imagine that any kind of smoke and/or vapor may cause irritation of the respiratory system and could trigger an asthma attack perhaps...?
I am by no means an expert or a doctor. I am merely speculating.
It is also important to note that sometimes (every time) you take DMT your senses and perception will be thrown off immensely. I have come back from deep journeys before where it felt like I had just taken a breath for the very first time (*Gasp*)! I was breathing the whole time but nonetheless, the feeling was there and it was a bit eerie...
So I am a bit unsure as to what might be happening. Perhaps someone with more experience can weigh in! Happy travels!
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