Aight, I ain't tryna discredit shit, but tryna make sure you don't talk out without understanding the plant.

Let's get into details, it's gonna be a small lesson. Apparently you think it's about my experience, but it's because for me it's about truth.

Hallucinations; I do get this feelings sometimes. My perception of life might just change and I suddenly begin to have the feeling that what is happening around me is not real. Funny though. 😆

Hallucinations could happen for strain containing high amount of THC, or using synthetic THC (called spice), but impossible with natural strains. Also, we need to differentiate Indica and Sativa effects, which are the two commons strains one THC oriented and the other one CBD oriented, which will NEVER CAUSE hallucination, as it has a calming effect only.

Real mind altering substances like MDMA, LSD, or psilocybin will create hallucinations, but weed on its own, will not.

Truth is, people that are suffering from hallucinations while smoking weed, would probably suffer from hallucinations while drinking coffee as it's apparently a gene linked to schizophrenia and has nothing to do with smoking weed.

Source: https://merryjane.com/news/scientists-just-figured-out-why-some-people-hallucinate-on-weed
source: https://www.diffen.com/difference/Cannabis_indica_vs_Cannabis_sativa

Respiratory problems; Breathing problems is most likely inevitable when you indulge in excessive and regular smoking especially when inhaling the smoke deeply. I do have a mild one though, I feel a little unease when breathing and feel like my breath is a little restricted.

This is so wrong for so many reasons.
Did you know that Marijuana actually helps you breath better? Weed has a bronchodilatator effect, in other word it will open your lungs, and help you breath better. It's not just for me, it's true for the entire globe, it also can cure asthma.
Now, inhaling carbon monoxide is bad for you, but you can always eat weed, or vape it to get the least amount of carbon monoxide.

Also, people tend to smoke weed with cigarette, which is terrible for the lungs indeed.

Source: https://www.health.harvard.edu/newsletter_article/pot-smokers-can-maybe-breathe-a-little-easier
Source: https://allergyasthmanetwork.org/news/cannabis-marijuana-risks-benefits-people-with-asthma/

Loss of appetite; It's crazy how a drug that increases appetite also makes you lose appetite sometimes. Very crazy right? Well, that's when it's been probably abused or if it doesn't roll well with your body system. I rarely ever get this feel but once in a while I do get it.

Again, it depends on the strain, THC weed tends to make you hungry as it burns more calories, wheeras CBD weed tends to supress hunger. Both of them has been linked to weight loss; however they have also been linked to an increase in physical activity for THC based weed.

source: https://www.medicalnewstoday.com/articles/324733#research
source: https://www.fatherly.com/health-science/can-smoking-weed-help-you-lose-weight/

Brain development; Studies and research has shown and discovered that weed aids brain development when taken moderately and coupled with some healthy and nutritious diet, your brain is sure to develop.

last one:
Once again, it's wrong, did you know that it's the exact opposite? In adulthood, the cannabinoids have actually been helping people with what's called neurogenesis. Not from my presonnal experience, but from a medical study

Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4543605/