Yeah, i want to believe the 3 seconds thing, but the fact is, i firmly believe htat holding it in for a bit longer DOES have an effect, and ive been smoking long enough to tell you that it definitely is not being lightheaded or oxy depravation (unless youre a 90 year old with emphysema, 10 seconds shouldnt give you lightheadedness -_-) It may be that the other psychoactive components in bud, CBN and CBD, take longer to absorb. who knows... i usually hold them in between 5 and 10 seconds.