Green Smoke is a deep, slightly grey-blue green that turns moody in low light and softens beautifully in the sun. The trick with a colour like this is to treat it generously and pair it with warmth, not cleanliness.
My first piece of advice: drench the room. Walls, woodwork and ceiling all in Green Smoke, just varied in finish — dead flat on the walls, eggshell or mid-sheen on the trim. It reads far more sophisticated than the usual white-skirting-against-dark-walls approach, which can look like the colour stops halfway up the room.
If you do want contrasting woodwork, do not reach for a brilliant white. It'll make the green look cold and dirty. Go for a warm putty white instead — F&B Shaded White is the classic choice. For a softer, lighter companion in connecting rooms, Farrow & Ball Au Lait (LRV 80) or Paper III from Paint & Paper Library (LRV 75.3) both keep that creamy warmth without going stark.
For accents, this is where Green Smoke really sings. Reach for deep plum and ink blue — never bright primaries, which fight it. A plum like Dulux Fuchsia Falls 2 (LRV 29.8) in cushions, an armchair or a velvet throw gives that proper old-world richness. And Mylands Cigar BH.20 (LRV 11.8), a dark warm brown, is a cracking grounding tone for leather, a console table or joinery.
The most common mistake I see? People panic that the room's too dark and chuck in a cool grey or a crisp white to "lift" it. That kills it. Green Smoke wants company that's warm and earthy — plaster, putty, plum, cigar brown — not anything cold.
Practical tip: this is a colour that genuinely changes through the day, so paint a large sample patch and live with it for 48 hours, north-facing and south-facing both. In a dim north room it'll lean almost charcoal-green; in evening lamplight it glows. Both are gorgeous — just know which you're getting.