je viens de tomber sur ce site qui explique que durant la guerre du Vietnam, certains soldats coupaient le fourneau / la cheminée de leurs Zippo pour consommer de l'opium, qui se fume à la pipe...
Cut away Chimneys
The authentic lighters sometimes their chimney cut away. Those cuts were done to light the opium pipes easily. During the last years of the war, many American GI's became bored at the lack of "Action" and turned to drug to relieve the boredom.
Disabused by too much horror, too many comrades injured or killed in frightful conditions, destabilized in their judgement by this war that they refused many turned to alcohol or drug.
What will be the future? Are they going to leave this country alive?
Some others, rocked by Jimi Hendrix music , used their lighters to warm heroine dose.