tbh with you, if you can limit it to one a day, then you have the 'willpower' to limit to one every two days etc.
One a day isn't a lot in the scope of smoking that shit, I used to be an all day every day guy, which yeah is excessive and does cause you problems. you my friend are coming to a stage where you need to make a decision, you are starting to weigh up the pros and cons of your actions, look at me 42, and still have a toke every month or so, but doing it every day would soon end my lifestyle, same as drinking everyday soon becomes a slippery slope. If you can moderate yourself all well and good, if you have the personality that means you need to do it religiously, then things get tougher.
The fact that you are basicaly saying "I don't want to go on like this" means you will make a break soon. I have found through experience that the need for stimulants in whatever form dwindles over time, not just from my own experience but loads of friends that I grew up with. those who just smoked weed, took e at weekends, did a bit of coke to party, have all 'grown out of it' those who hit the smack, other opiates, K, and crack, are now fucked or dead (I have seen a few friends die), same as the booze, loads of people my age have drink problems, beer bellied mother fuckers, hitting the booze every night, that would disown me if they knew I had a joint every now and again.
Take your life by the horns, figure out what you want from it and hold on tight. moderation IS the key, but if you cant moderate dont do it.
One a day eh?