Self-reflection is a humbling process. It's essential to find out why you think, say, and do certain things. then better yourself. Amen, and be sure to be honest about your discoveries so you can truly better yourself.
When the brain believes a harmful substance is beneficial, habits become addictions. No matter what the substance, repeated use of anything that mimics and over-stimulates the natural “feel good” dopamine that our brains produce causes problems.