Here's an interesting question about salvia...

yep, the salvia threads never go away!:D but I think this is a pretty darned good question.

so anyway, I was thinking about it today, how when i first get a hold of some I'd just take 1 hit and hold it for 5 seconds and first see how that affects me. you know, dipping your toe into the pool before you jump in. So now I'm thinking, how many times can you get back up on it? I mean every time I smoke weed in the same day, it's weaker the second time, even weaker the 3rd, and so forth. would salvia stop being effective trying it several times in a day? like I try one hoot, then 2, then 3, etc.

believe me man... you prb wont wanna do salvia more than once in a day :p
possibly even a month depending on the trip.

I tried acclimating myself to salvia before going to level 5 with it by taking rips of it throughout the day. After 2 or 3 days of taking a bong rip of salvia every 3 hours had got me kind of used to the state of being you are in on salvia. And, yes, your tolerancy definitely goes up. At first it took just a wisp of smoke for me to get those initial bugged out feelings now it takes 2 or 3 which is why I use the quid method.