Sure, you’ve gotta have the pot to smoke it. But the crime you’d be charged under is “possession”, not “use”. And to prove you possessed marijuana, the cops generally need to have the marijuana you possessed. A picture of you smoking an unidentified plant or snorting an unidentified white powder isn’t enough to charge you with possession of a controlled substance.
I’ve served on the jury of a drug case…and during the deliberations we were handed a plastic baggie with a white powder that the cops said was the defendant’s cocaine, and the defense team didn’t spend any time denying that the white powder was cocaine, they tried to argue that it wasn’t his cocaine. But a video of a guy snorting a white powder? How is that going to get a conviction?