Earlier quoted context omitted.
Cannabis addiction is a bitch. It also is really tough to get off of. If you use too much too often, you can get crazy sweats, horrifying nightmares (that are more real than being awake), irritability and headaches that make you want to relapse. The worst part about cannabis addiction is it's mostly psychological.
Cannabis addiction, if that even exists, isn’t a bitch at all. Nicotine addiction is kind of a bitch. Opiate addiction is a bitch.
Of course it exists. You can be addicted to anything: caffeine, chocolate, sugar, video games. It just means you have a dependence on it that is tough to break. It could be a physical addiction like nicotine or alcohol, but it could be a mental addiction or even just a routine that's hard to break.
Anything that either provides stimulation or that numbs you is, in my opinion, pretty addictive: all you need is someone who is somewhat susceptible to it (maybe they have a stressful job and like a distraction. After a while it becomes routine and hard to break out of).
Just because there are worse addictions doesn't mean its not a big problem and causes people hardships. Your comment seems very callous to me.