From the first breath in, it burned and caused me to cough. For the first several breaths, it caused me to cough immediately after, and my throat felt really, really dry. I had to swallow after every breath. If you have ever smoked pot (for me, over 25 years ago in high school) that's what it feels like. The burning and coughing, but not as severe, only one little cough after each breath. That did lessen after a bit, but the burning and dryness continued without the need to cough. I finished over a half hour ago and I still have a funny throat irritation. My voice got a little hoarse as well. Not much, but I noticed. I also noticed that my nose was stuffy immediately after the treatment. Not runny at all, just stuffy, but it's going away already.
I also just got a headache. Nothing major, and not the 'bad kind' of headache, but definitely a headache. I'm 95% sure it's from the treatment, because I rarely get headaches and when I do, they don't feel like this. They are usually a different type of pain and more debilitating. This one feels almost exactly like a brain freeze and like it's going to go away very shortly.
According to the scientist that created the cure, people will either feel alert after treatment or drowsy after treatment. So after I figure out which one I am, I do the treatment in the evening or in the morning. I am definitely feeling drowsy, and I had planned to do it in the evening anyway, so I think this is going to work good :)