Good product if you stick to it.
I used to smoke heavily and have since cut down to about 1-2 a week and have been trying to find ways to improve my breathing and running stamina. I found this product and gave it a shot. It does improve my breathing capacity slightly and it helps me feel noticably more rested when I wake up in the morning. I keep it in my car and use it when I commute as well as sometimes before bed when I'm watching netflix. All in all if you use this in conjunction with running (1-2 miles 3x a week) and a healthier diet you'll feel much more energy and might even lose weight. I am not a doctor at all but that's what happened to me.
Rating: 3 stars