I haven't heard of such a thing... but that doesn't mean its not possible... just highly unlikely. Ive spent a lot of time here and never have heard any thing besides possibly mango or peaches... and even those, with a lot of backing, have proven to be silly (dealing with mycrose increasing high from preloading on fruits) and have no sig. findings in any study. I'd have to do more research on this as I have never heard of it or any effects - which leads me to think BS - but I will leave it open for possible discussion.
edit: Did a little reading and this seems to be an asthma medication, but OTC and herbal. I doubt that you would see a major change in it. Like I said I will leave it open for a short white to see if it garners any attention, but I highly doubt it. At most it may increase lung capacity and thus absorption rate, but that depends on strain just as much. It's like asking if holding your hit in for longer will get you higher - no, it has to do with the strain, not the duration of depriving yourself of oxygen. If this works, then an inhaler should work 10 times as well, which it does not.