Not just one person, I have heard this from multiple people. I don't smoke before I go train. I don't smoke in my gi. I don't keep weed next to my gi either. The thing is they don't say I smell like smoke but the actual dried plant. I quit smoking for a year and still got comments. Currently I don't "smoke" it but I use a pen that takes cartridges (it no smell or anything link: http://www.greenwavevape.com/) and the other day my training partner tell me I always smell like weed. I have pondered about this for a very long time and the only thing I can think of is my natural body sweat just happens to smell like marijuana. Keep in mind that I am not able to smell what my training partners are smelling.
I get kinda embarrassed because I don't want people thinking i'm always coming in high lol. I don't know what is causing this
MarsMan -Lol
It really is irritating when a training partner smells like this. If you want it to stop then stop smoking weed. 
Lol the most offensive smell
flaco_62 - Lol the most offensive smellHalf my class bakes before. Even before we compete. But we bust our asses, daily, and love bjj.
Welcome to NYC lol
JoejitsuMD - It really is irritating when a training partner smells like this. If you want it to stop then stop smoking weed.
You didn't read what I wrote bra. I said I did quit for over a year and still got comments.
And again, its not the smell of it being smoked but the actual plant. - Smoking vanilla does sound tasty though haha
Eh...maybe you just stink. Change laundry soap, change shower soap and shower right before training, consider lotion. Simple.
Loudly accuse them of smelling like weed before they have an opportunity to say anything about you. That way they'll be paranoid that it's them.
CoughSyrupOD -
Loudly accuse them of smelling like weed before they have an opportunity to say anything about you. That way they'll be paranoid that it's them.
Voted up.
Some people always smell like it.
It's a pleasant aroma. Delightful even. The ones who find it irritating are suspect weenies and their opinion should hold little weight.
The real issue is the people that get that sweat activated fish smell in their Gis from using too much soap in their front loader washers. Or the dummies who slap on copious amounts of cologne before class..... or those infernal Dutch
Just own it.
BJJ players who don't smell like weed are the ones who smell bad IMO.
Maybe your home smells like it? My buddy smoked so much weed that the smell stuck to the walls,couch, carpet. I'll take weed over BO, fresh cooked meals or shit.
Better then smelling like B.O.
My buddy smells like weed all the time when he wears a certain go, but he never smokes period.
I'll take weed smell over the dudes that don't wash their Gis or have bad BO any day.
ninosboy - Eh...maybe you just stink. Change laundry soap, change shower soap and shower right before training, consider lotion. Simple.
Never shower right before training.
Your body's natural fauna takes an hour or two to regenerate, and during that time you'll be more susceptible to mat infections
i've never even tried smoking anything. To me the most offensive smell by far is when rolling with someone that smokes cigarettes. BO is a distant second.
OP You don't happen to be wearing a hemp gi by any chance? I've actually heard from two people that hemp gis start smelling like weed after a few years of usage.
You know you're part of a very strange sub-culture when grown men openly discuss what might cause a practitioner to smell like weed.
Honestly, I wish my training partners smelled like weed - that would be a relief from the terrible odor they have.