Just a simple bluff and it actually worked, it kind of cracked me up how easily Jotaro found out who the stand user is
Also that Tennille captain complained about ash getting into the ocean but he just left the real body of the captain on the bottom of the ocean, kinda weird
if you think about it the fact that he invited jotaro into the water and the things in his pockets can be taken out easily means that the cigarette probably went into the ocean anyways