My Personal Issue with Smokers (in the Workplace)

I am a minority in my workplace - a non-smoker.  No offense to anyone personally, but I hate smokers. Hate working with you. I watch you walk out of the store at least once an hour, sometimes even more & spend 5-10 minutes because you "have to have a cigarette" - while I am stuck taking care of customers without anyone to help me.
And you can't just go alone - smokers in the workplace seem to like to smoke in groups. Meanwhile, my line is getting longer and longer, I am dying of thirst or need to use the bathroom, but can't because there is no one else in the store! 10 people are in my line already, the phone is ringing, the CAT scale is buzzing in with a truck needing to be weighed, someone's having trouble with the "pay at the pump" card reader, someone wants to buy an item from the display case, someone else needs to send a fax & oh yeah, did I mention I need to use the bathroom?? You can see me in the window, I know you can - but you puff and chat and then come in & make me look incompetent by asking "Why didn't you call for help?" 
Why should I have to call you for help? You can see me, you can see the customer line - I don't have time to call you over the radio, ok? I am doing your job AND mine & trying to do it with a smile & pleasant word for everyone in line.
When you come back inside the building and I tell you I need to go to the ladie's room, you expect me to clock out for a break, yet it is perfectly fine for you to spend an average of an hour a day getting PAID to SMOKE??? That is just messed up.