• 煙けむる — to smoke; to be smoky
• 煙けむり — smoke
• 煙けむい — smoky; stifling
• 喫煙きつえん — smoking (tobacco)
• 煙突えんとつ — chimney
• 煙幕えんまく — smoke screen

煙 is phono-semantic: the left side 火偏 signals fire/heat, while the right component 因 provides the sound エン and hints at something enclosed or lingering. Together they point to smoke that rises and hangs, hence meanings like “smoke” and “fumes.”