I think it's a load of crap. I have never smoked cigarettes. I have on the other hand smoked marijuana to a good extent. I have also stopped on several occasions for anywhere from a week to a full year. I have never really experienced any real withdrawal symptoms other then thinking about how it would be nice to have some weed.

Now if this is comparable to tabacco, then all those people that can't quit are a bunch of whining pussies. Although, I doubt that is the case. So anything that says cannabis is comparable to tabacco in the forms of addiction or withdrawal, I would immediately disregard. Or even any other addictive drug for that matter.

4-20 will probably be the last time I smoke for about a month or so. I can pretty much guaranty that I will not have any withdrawals over that period. Every other time I have quit, I have felt perfectly normal and even felt like I had more energy at times.