Bear in mind that some people do not experience effects their first time smoking, or maybe even the first few times. The first time I smoked, nothing. The second time, still nothing. Third time: BAM!! So, if you don't feel anything the first time out, don't fret. My suspicion is that some people don't have sufficient CB1 receptors in their brains, but smoking weed for the first time begins to trigger the formation of additional receptors. Once sufficient receptors are present, then the effects of smoking become stronger. I don't know how frequent this condition is, but it seems to be fairly common, from what I can gather.