I saw the other post regarding quitting smoking, but it appeared to be more focused on cigarettes and nicotine. I've never smoke cigarettes. I have smoked weed for 15 years almost everyday. I am on my 4th day without weed cold turkey. Day 1 and 2 were brutal. I vomited. I was nauseated. That has passed. My anxiety levels are through the roof with some depression. My appetite is zero. My mood is pretty much wanting to beat the shit out of everyone and everything. Sleep? What is that? I ran 3 miles today (I ran 4-5 days a week even when I smoked). That helped tremendously. Baths help.
Anyone else quit cold turkey? Any advice? Your experience?
First off, cold turkey is a no go. You have been using this substance for the last x years, your body will not appreciate you suddenly cutting off its supply of a usual substance. The anxiety is mitigatible, occupy yourself. You don't smoke.while.you are out and about, be more out and about. Besides occupying yourself, ID suggest stepping down in a reasonable manner (halve your consumption every week). The aggression will dissappear; it's simply withdrawal.
I have been smoking pot most days for the last 15 years myself. I don't intend to quit

If you've been smoking weed for the last 15 years, then could turkey is not possible because you are already dependent on it and its hards to push past your craving because biology cannot be conquered by sheer willpower sometimes. Only option for you is to do a full rehabilitation. Because rehab will give you a intensive treatment, medical help and counseling during the process. You just have to remember though that you have to fully commit to it, including the monetary aspects to put your life to back together once again. Goodluck mate.