For me it took as long as it took to get myself to the point that I just couldn't smoke anymore. I started smoking herb in HS, and never looked back, just turned 49yo. Got my first vaporizer back in 1997, it was like a ceramic smiley face with a fishbowl on top of the heating element to catch the "vapor", had no heat control and tended to burn quickly. Then i got a volcano back in 2007, and used it pretty exclusively at home, but while out i still smoked joints bowls and the ol one hitter i took with me everywhere. Finally this year after some very bountiful harvests I found myself with more herb than ever & the joints got really really big, and continuous throughout the day/nite for several months until i developed a pretty chronic smokers cough. Then after scoring some shatter and making moon rocks for my bong, my respiratory system started to say enough is enough. The cough started to hurt, and there was lots of tar coming up from my chest. Honestly it started to freak me out. Of course i had done all the research and knew about vaping and making edible oil, but i hadn't gotten to the point psychologically where i could believe that vapor could get you as high as smoke. Now I feel that vapor gets you 10 times as high as smoke. With smoking i could never get past a certain point, with vapes, i can go beyond and back. Once i determined to fuck combustion i decided to go all in and purchase a bunch of vapes. The Extreme Q, the Air, wispr2, mighty, MFLB, Vaporgenie sherlock bronze and glass, the nano log, and the dynvap. I use my old bongs with there nano, and i gotta say having a wide range is the best way to keep myself hooked into the practice of vaping. Im getting more out of my herb, and I'm getting higher than I've ever been. I think a big thing that got me over the psychological hump was some info i read on here about the combustion high vs the THC high. It seems i had confused toxic carbon poisoning with the weed high. Seems I was actually chasing the combustion high, and killing my weed high, until i realized this. It took me about two weeks to detox from the smoke, but now I've broken through and will NEVER GO BACK!