Alright, from expierence i can tell u that smoking (weed,pot,marijuana,bud,ganja,) or whatever u call it that it does affect some people. Other people it has no real effects might gain a little weight, but nothing major. other people though get lazy and don't care as much but physically it causes no major damage. Mentally it can make you lazy and lose ambition. just depends on how it makes you feel.
If this is just a social situation then you don't, just ignore it. If the lie affects you professionally or it has been published, you don't have to prove anything. If what is being said is untrue then go and get the help of a solicitor (attorney) and sue the accuser, they then have to prove their allegations.
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