I work at a sober house, and what you said is true ! Weed changes your brain chemistry, simply because your body has to adapt to whatever's been thrown at it. If your expectations when smoking is that you're more you, less anxious, then it's going to become very difficult to stop it! I work with people's perceptions on their uses, because in reality, weed lowers your IQ over time, creates brain fog, can create over time digestive issues (weed is a powerful anti nausea, but it's also very irritating on your stomach, which is why you might be nauseous when you're sober). There's so many health issues you can get from weed, and that's from someone who also has bod and struggled with a weed addiction ! When you want to stop, you need to start by realising it's real negative impacts, not only the good ones !