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Vaporized Marijuana, without a doubt.
>no smoke
>no waste
>absolute best environment to be high in
The cons of course are you gotta find a vaporizer that won't fucking explode or burn your house down because those things are manufactured with ZERO safety regulations. I don't even know what the fuck that one in my pic is, I just wanted an example from google.
/g/ or 420chan are probably good places to look for recommendations