dude, there's so many people on both sides, here's what you do: Take a bag and smoke two different times but same amounts. First time smoke it like you would a cigarette, then next time hold that shit in as long as you can. If there's no effect for you, then why bother.
Personally I hold them in as long as I can, because for me I feel the effects more. My buddy absolutely hates smoking and for him holding the hit in does nothing for him. So really just try for yourself bro! Happy smokin!