smoking too many cigarettes sore throat irritation associated with e-cigarette use: a case report How Smoking and Nicotine Damage
Description
How Do You Treat Nicotine Withdrawal

So, if you find that there are no serial numbers on the product you have bought, you might find its a fake

If you'd prefer not to start at maximum strength, use this guide based on your previous smoking habits: I smoke fewer than 10 cigarettes per day: 6 - 10mg I smoke between 10 & 20 cigarettes per day: 11 - 15mg I smoke 20 or more cigarettes per day: 20mg Many users then choose to gradually reduce their chosen nicotine strength over time in 3-5mg intervals
Cancer 2014;120:36173626

Health experts recommend that good cholesterol levels will gradually recover immediately after quitting smoking
