I don't know if it does or not, but out of habit I have always held it in for just a few seconds. When I first started I held it in much longer, but now I just hold it in for like 3 seconds or so. I should try not holding it in at all and see what happens.

Would be cool if we could get some scientific data on this issue (links )
Nailhead Reviewed by Nailhead on . do you -really- get higher if you hold it in? I been trying to blowing it out after a few seconds, I have to say that the effect is similar :( or :) I dunno which :O Rating: 5