Invest in some e-cigarettes long before one travels, alternate between smoking those and the real thing then when one travels go on the e-cigs which are aroma and smoke free.
But, when I went on e-cigs, alternating between them and the real thing, one was costing me 6 quid a month whilst the other was costing me 6 quid a packet ... I soon gave up the real thing and 6 months later I gave up the e-cigs also, it's getting on for 4 years now that I've been smoke free.