What the heck do they put in Tim Horton's Coffee?

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I like coffee but not as much as others. If I"m up early in the morning going to work or coming from work off a nightshift, when I lived at my mom's, I would have to pass by a Tim Hortons all the time. The line ups for the drive thru, were unbelievable! They would go down a block till you seen the end person waiting. It's crazy! Other coffee places are never that busy! Sometimes I wonder what they are putting into their coffee?