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. i knwo a guy who was the h0rniest toad i have ever met at the age of 23 and i talked to him recently again and he's 31 now and he has changed so much, he is now almost brimming upon impotence, and he said its cuz he smoked so much pot in his 20s and i remember back in the day when i hung out with him he was always stoned. also i know a few others who smoke a lot and whose sex drives have dipped. is this true?

smoking weed is hella dumb, so just stay away from it in general... its illegal for a reason. Then again all the people that smoke weed are stupid enough to think the government is corrupt and screwing people.
And to answer your question, yes, because it affects the motivational part of your brain which in turn can screw with many other functions of the body...

smoking pot lowers everything including your life span!

Smoking weed doesn't lower your sex drive per say. It just makes you lazier. You still have the urge to have sex, but you're just to lazy to perform the act. It should not affect you if you quit smoking. To me nothing is wrong with marijuana if you do it in moderation. And I mean moderation in the fact that you need to get all your stuff done before you smoke it, i.e. at the end of the night. Marijuana has a lot of medicinal purposes and it is all natural.

Yes lot of smoking effects.

Smoking pot causes "Limp Dick"!

I think that's really true. Smoking may lead to bad sexual health. Try to avoid smoking if you want to be good in bed and make your partner satisfied.