Day 20 after quitting vapingToo many receptors

By Yevhenii, who smoked for 26 years · Updated 30 Oct 2026 · 2 min read

In shortYears of nicotine make the brain grow extra receptors, still raised at four weeks and back to normal between six and twelve weeks in one small study of smokers. A craving with no trigger is that hardware being dismantled, not weakness. It has not been imaged in people who only vaped.

What's happening in your body

Long exposure to nicotine makes the brain grow extra nicotinic receptors, and they do not vanish when the nicotine does. In brain imaging of smokers who had quit, receptor levels were still raised at four weeks and had come down to the level of never-users somewhere between six and twelve weeks. The study was small, and only six people were scanned at the latest point.

The growth is driven by nicotine, and nothing suggests the brain cares how the nicotine arrived, but it has not been imaged in people who only vaped.

What to expect

This explains a puzzle. The drug left in three days, yet something physical still seems to ask for it. That something is real and it is on a schedule. You are about a third to a half of the way through. It also explains why a craving can arrive with no trigger at all, on a calm evening when nothing has happened. Your brain is dismantling hardware it built for nicotine, and it complains while that happens. That is not weakness and not a step backwards.

Try this

The next time a craving comes out of nowhere, name it to yourself as the receptors, and note the time until it fades.

What else you could do

Mark those unexplained cravings in the Diary over the next few weeks. If the picture from the study holds, they should thin out. Nicotine replacement works on exactly these receptors, so if they are giving you a hard time, a pharmacist can talk you through the options. A patch is not a vape. And while you wait, the same things still help. A short walk, a glass of water, the minute of breathing in SOS.

Sources. Measured in smokers, the mechanism is nicotine. Cosgrove KP, Batis J, Bois F, et al. Beta2-nicotinic acetylcholine receptor availability during acute and prolonged abstinence from tobacco smoking. Arch Gen Psychiatry, 2009. Not imaged in vapers.