Hello, I've been reading that minoxidil likely works because it is a vasodilator and increases blood flow to the scalp. I've also read that smoking is linked to hair loss in some way. As you may know, nicotine is a vasoconstrictor, so it seems at least somewhat likely that this could be a mechanism that contributes to this effect (there are other speculated causes too). I smoke, but I am literally quitting right now because of this. However, I also take Adderall, which I'm not sure I'd want to stop taking because it is quite helpful. I only started taking it 3-4 months ago and recently I've noticed that my hair looks really bad, BUT I also started taking Propecia a month ago and began using Rogaine about a week ago, so this may be why I'm shedding so much (or maybe I'm just running my hands through my hair more to see if I notice a difference, who knows). Anyway, I have a few questions. 1. If Rogaine is effective because it is a vasodilator, then isn't it reasonable to assume that vasoconstrictors (most stimulants) would work in the opposite way? Will the Adderall negate the effect of the Rogaine? Would taking Arginine help mitigate this? 2. Has anyone ever quit smoking and noticed that it helped grow some hair back or made it grow thicker (like Rogaine)? Does it cause a shed? 3. If blood circulation has a role in hair loss, why is it always denied so vehemently that cardiovascular health is related to it? I realize that DHT is the cause of hair loss, but if Rogaine works by increasing blood circulation, isn't it possible that exercise acts as a "natural Rogaine"? I notice that people with bad hair loss for their age seem to be out of shape often. Coincidence?