I feel like i am always in a dream. everything seems foggy. i use e cigarettes (juul) and i was wondering if that is the cause of my brain fog. ?

Nicotine is a drug: and can certainly be affecting your brain. It would be advisable to stop.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Do not use tobacco.