Last Night I Smoked Three Cigarettes Prior To Sleeping, Woke

Last night I smoked three cigarettes prior to sleeping, woke up feeling fine. Decided to take a shower and I felt my breath catch and as I tried taking a deep breath through my mouth I completely blacked out and dropped. Woke up feeling a little disoriented but I was able to get up and finish my shower. Was wondering if the cigarettes caused this shortness of breath. I don't usually faint so I'm a little concerned.