Biggest thing, watch & listen to ducks. If you have a city pond thst has a bunch of ducks in it, watch & listen for a few hours. When you're in the blind, watch how they respond to your call. Sometimes they wanna talk, sometimes they don't. If they're obviously flaring at your call & you know it sounds good, get off it. If they are coming towards you & you can hear em talking, try to imitate exactly what they're doing, down to the cadence of their quacks. If they're 500 yards away & not paying any attention to ya, blast away. What's the worst that can happen?
Cigarettes are like hamsters. Perfectly harmless til you put it in your mouth & light it on fire