try understanding that it hits different people differently.
Some weed just creeps. sure you feel something while you are still holding the joint or the baong. but you dont feel the real effects for at leat 15 minutes, sometimes longer.
As for smoking for 30 years, that is hardly an accompishment given the age of most on this forum.
Besides there are folks out there that have been having sex for 30 years who stil don know what the fok they are doing,