My friend smokes weed, and his head moves and sways back and forth. He says that he can't control it. This just started like 3 months ago. Recently, he's been cutting down on smoking, but his head twitches sorta like a head tremor, even when hes not smoking. Is there a way to prevent this? He's pretty sure that the weed was mixed with Febreze, and his head can't stop twitching. Is there a way to remove the chemicals? what do you guys think?