Nicotine definitely interacts with your dreaming. The simple explanation is that It changes the way acetylcholine binds with receptors in your brain. In the short term, nicotine can actually increase dream recall and vividness. Many people report crazy dreams when they wear the nicotine patch, for example. In fact, I've known several people who wear it recreationally when they sleep. That doesn't mean nicotine is good for dreaming, though. Habitual nicotine use can cause desensitization to the abnormally high levels of acetylcholine in your brain, which may be what is interfering with your dreams.
I don't really understand the details, myself, so someone else can give you a better answer. If you are into such things, you can do some research about nicotinic acetylcholine receptors in the brain.
Keep in mind that our dreams change, naturally, as we age. We tend to dream less often as we grow older. You can't compare the dreams you had as a teenager with the dreams you have as an adult. Teenage years are an amazing time for dreaming.
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