>I have seen nicotine inhalers sold over the counter in Canada (Amazon search) yet they are not sold in the US, from what I can tell. Are these inhalers effective and if so, do you know why they are not sold in the US?

We’re trying to answer some lingering questions! In the U.S. you need a prescription from your doctor for nicotine inhalers but they are available. Nicotine inhalers are a useful NRT because many people who smoke are used to receiving nicotine hand-to-mouth which can reduce craving separately from just the nicotine that is delivered.