I smoke with 6 friends, when I went back home I realised my lips have a cut and it’s chapped, the environment was so dark that I can’t see the cigarette was with blood, if my friend has a bleeding lip and there was blood on the cigarette, is it possible that he will transmit hiv to me? There was a 5seconds interval before cigarette was passed to me. And I took about 10 puffs.