It looks like many of the symptoms we're seeing are common with ALL NRT's and not necessarily something wrong with e-cigarettes or e-juices.
Info below found on webmd (I can't post the link)....
Nicotine replacement therapy for quitting tobacco
Side Effects
Since all NRTs appear to work equally well, many smokers choose a treatment based on how easy it is to use and what possible side effects it may cause. All forms of nicotine replacement have side effects, but the types of side effects differ across NRTs. Very few people (less than 5%) have to stop using a nicotine replacement product because of side effects.
Stopping nicotine replacement therapy abruptly may cause some of the same withdrawal symptoms that occur when you stop smoking cigarettes. You are less likely to have withdrawal symptoms if you gradually decrease the dose or number of uses of the specific therapy per day.
It is possible for a person to become dependent on a nicotine replacement product, although this is rare.
Gum
Side effects of nicotine gum may include:
* A bad taste from the gum. A mint and a citrus flavor are available, and most people find they taste much better.
* A tingling feeling on the tongue while chewing the gum.
* Hiccups.
* Upset stomach (nausea) or heartburn. This is sometimes caused by improper use, such as chewing the gum without "parking" it between your cheek and gum.
* Jaw pain caused by chewing. Nicotine gum is not recommended for people who have problems with the jaw joint (temporomandibular, or TM, disorders).
Lozenge
Side effects of nicotine lozenges may include:
* Upset stomach, especially if you swallow the lozenge.
* Hiccups.
* Heartburn.
* Headache.
* Excessive gas (flatulence).
Patch
Side effects of nicotine patches may include:
* A skin rash at the location of the patch. This may be a reaction either to the sticky backing on the patch or to the nicotine. People with sensitive skin or allergies to adhesive should not use the patch. Moving the patch to a different part of your body or using a nonprescription antihistamine cream, ointment, or gel (such as Benadryl) may relieve some of the discomfort.
* Sleep problems when using a 24-hour patch, such as having trouble sleeping or having especially vivid dreams. This is because your brain isn't used to getting nicotine when you are sleeping. Removing the patch after 8 p.m. may help decrease this side effect. If the sleep problem is a nicotine withdrawal symptom, not a side effect, removing the patch may not help. Talk with your doctor if you have sleep problems.
Inhaler
Side effects of nicotine inhalers may include:
* A cough.
* A scratchy throat.
* An upset stomach.
The nicotine inhaler may not be a good choice if you have a breathing problem, such as asthma, allergies, or a sinus condition.
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About
Do not continue to smoke while you are using nicotine replacement therapy. You may overdose on nicotine if you smoke regularly and use nicotine replacement products at the same time. An overdose of nicotine can cause headaches, nausea, confusion, and vomiting. If you think you have overdosed, call your doctor right away.
Regardless of the method you use to quit smoking, you may cough more or start coughing for the first week after you quit. This is not a symptom of withdrawal from nicotine-it is the result of your body trying to clear your lungs. This happens whether you use nicotine replacement therapy or not.
With nicotine gum, lozenges, and the inhaler, not taking enough is a common cause of relapse. Avoid drinking beverages, especially acidic beverages (such as coffee, juices, and soda pop) for 15 minutes before and after you use these products. Your body may not absorb the nicotine well because of the acid in these drinks.
Info below found on webmd (I can't post the link)....
Nicotine replacement therapy for quitting tobacco
Side Effects
Since all NRTs appear to work equally well, many smokers choose a treatment based on how easy it is to use and what possible side effects it may cause. All forms of nicotine replacement have side effects, but the types of side effects differ across NRTs. Very few people (less than 5%) have to stop using a nicotine replacement product because of side effects.
Stopping nicotine replacement therapy abruptly may cause some of the same withdrawal symptoms that occur when you stop smoking cigarettes. You are less likely to have withdrawal symptoms if you gradually decrease the dose or number of uses of the specific therapy per day.
It is possible for a person to become dependent on a nicotine replacement product, although this is rare.
Gum
Side effects of nicotine gum may include:
* A bad taste from the gum. A mint and a citrus flavor are available, and most people find they taste much better.
* A tingling feeling on the tongue while chewing the gum.
* Hiccups.
* Upset stomach (nausea) or heartburn. This is sometimes caused by improper use, such as chewing the gum without "parking" it between your cheek and gum.
* Jaw pain caused by chewing. Nicotine gum is not recommended for people who have problems with the jaw joint (temporomandibular, or TM, disorders).
Lozenge
Side effects of nicotine lozenges may include:
* Upset stomach, especially if you swallow the lozenge.
* Hiccups.
* Heartburn.
* Headache.
* Excessive gas (flatulence).
Patch
Side effects of nicotine patches may include:
* A skin rash at the location of the patch. This may be a reaction either to the sticky backing on the patch or to the nicotine. People with sensitive skin or allergies to adhesive should not use the patch. Moving the patch to a different part of your body or using a nonprescription antihistamine cream, ointment, or gel (such as Benadryl) may relieve some of the discomfort.
* Sleep problems when using a 24-hour patch, such as having trouble sleeping or having especially vivid dreams. This is because your brain isn't used to getting nicotine when you are sleeping. Removing the patch after 8 p.m. may help decrease this side effect. If the sleep problem is a nicotine withdrawal symptom, not a side effect, removing the patch may not help. Talk with your doctor if you have sleep problems.
Inhaler
Side effects of nicotine inhalers may include:
* A cough.
* A scratchy throat.
* An upset stomach.
The nicotine inhaler may not be a good choice if you have a breathing problem, such as asthma, allergies, or a sinus condition.
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About
Do not continue to smoke while you are using nicotine replacement therapy. You may overdose on nicotine if you smoke regularly and use nicotine replacement products at the same time. An overdose of nicotine can cause headaches, nausea, confusion, and vomiting. If you think you have overdosed, call your doctor right away.
Regardless of the method you use to quit smoking, you may cough more or start coughing for the first week after you quit. This is not a symptom of withdrawal from nicotine-it is the result of your body trying to clear your lungs. This happens whether you use nicotine replacement therapy or not.
With nicotine gum, lozenges, and the inhaler, not taking enough is a common cause of relapse. Avoid drinking beverages, especially acidic beverages (such as coffee, juices, and soda pop) for 15 minutes before and after you use these products. Your body may not absorb the nicotine well because of the acid in these drinks.