Green’s Dictionary of Slang

(drugs) an enthusiastic smoker of cannabis.

2006		Urban Dict. 22 Jan. 🌐 swed drugs From the phrase ‘Smoke Weed Every Day’ found in the song ‘the next episode’ by dr. dre and nate dogg.
2020		G. Armstrong Young Team 122: ‘Oh sorry, swed. Didnae realise Ah hud fuckin puffed it away’.