hello everyone. I was upset to see a few replies here that seemed a bit critical toward the OP, and also suggesting she was being paranoid about vaping. If a symptom starts the same time as when you start vaping, then it is rational to suspect that vaping may have something to do with it- this my friends is called COMMON SENSE. She wasn't ruling out that it may be something else, but she is right to have a suspicion at the least! There is nothing paranoid about that!!
There has been quite a few men responding, and I hope you all understand that mens and womens hairloss are VERY different. If a woman is losing hair in her thirties this is generally not considered part of the normal aging process, for men on the other hand, normal, natural, genetic hairloss, usually does begin in the 30s and very frequently the 20s too. Women do often naturally thin out as they age as well, but no substantial/noticeable thinning happens until the 50s, and then, if it happens at all! If hair loss happens for women in their 30s, there is something wrong (such as a hair loss disease, perhaps some unusual genetic disposition to hair loss, a serious hormonal imbalance, an illness such as hypothyroidism, or some other health problem or imbalance).
many people have responded asking the OP to see a doctor and she has repeated several times that she has already seen a doctor and all tests came back clear. Sure she may keep digging and keep trying to find an answer that the doctor could not find- which is not an easy process, and may led no where. I agree that the presence of an itchy scalp does sound like an allergic reaction. But I am also aware that hair loss itself can create itching in the scalp, but then there is the rash... My opinion is its the nicotine itself could be causing the hair loss, but its just a guess. Allergy testing would be ideal (although I'm sure it would be expensive, time consuming and probably tricky to organise). Ive read a woman who was already diagnosed with alopecia, and she said that vaping made the condition a lot worse, she wasn't sure exactly why, but knew it made it worse. A trichologist is the person to see to diagnose whether or not your is or isn't alopecia, but if you don't have women in your family with it, well, your probably safe, as it is genetic.
Yes a medical opinion is better then seeking advice from a forum, but if your doctor couldn't give you an answer (as was the case with the OP) then it is natural to ask around to see if anyone else had this reaction to vaping, to help narrow down what might have caused it. There is nothing foolish about that!
Now, I say all this as someone who also noticed a great increase in hair loss since I started vaping. I am also 33 (what a coincidence

) and I am also female. I am a little hypothyroid and I have this confirmed by tests. I have been hypothyroid for quite some years, but it is fairly mild. I have always shed more hair then is normal, and because of this I been reading up a lot about female hair loss for many years. I have resorted to hair growth stimulating products to keep me from getting too thin (not rogaine, but kerastase hair loss products, and nizoral shampoo to control shedding as it removes excess DHT from the scalp) and I also have to pay attention to my lifestyle and health to keep my symptoms under control. This is the reason I switched to vaping myself, as nicotine is stressful to the adrenal glands, and adrenal health is very important in managing thyroid conditions. I started vaping as a means to quit smoking and wean myself off nicotine.
As soon as I started vaping, my hair shedding more then doubled. It was nothing short of undeniable. I didnt get the rash or itching, but my hair was definitely thinning out. And I had people on forums try and call me paranoid too when I posted about this (well lets see it happen to them and see how they like other people calling them paranoid huh?) The more nicotine that I have in my liquid, the more profusely I shed, the link between the two events is extremely obvious. I had more hair shedding when I picked up the cigarettes too after having quit for 6 years, but it was nothing to how bad its gotten since vaping. Many women on forums talk about how they started NRT (like nicotine gum) and that hair loss began when they started the gum. There is not much research into this side effect, but ALOT of anecdotal evidence that this is not uncommon. Anecdotal evidence is not worthless. Its all we have when there are no actual scientific studies, and when doctors are not able to provide us with answers.
Finally, I just want to say that I personally don't believe vaping or NRT "causes" hair loss. From what I see most people don't have this reaction. However it also seems, there are some people who do have this reaction, and in my opinion, there is a connection between vaping/NRT and hairloss for THOSE people. Vaping is a different delivery method of providing nicotine to the body then smoking. Just like with other NRT methods, there are lower spikes of nicotine in the blood, but higher troughs. This means there is a more stable level of nicotine in the blood stream then there is with smoking. This is at least one thing that HAS been proven in scientific/medical studies. And I'm sure almost all of us can attest to the fact that we seem to spend more time vaping then we did smoking. It is certainly possible that the difference in the way nicotine stays in our blood stream like this with vaping and NRT could well cause a different physical reaction compared to smoking tobacco, for at least some people.