There is an option in the dialog when you talk to the Smugglers Agent for the 2nd time ( after you have found out the schedule ) to abandon the smuggling if you are not happy and think you can't do it. 
The schedules change over time - check your ships log for notifications if they are increased or decreased.
Ships log is updated by asking tavern keepers for any news.


The schedules change over time - check your ships log for notifications if they are increased or decreased.
Ships log is updated by asking tavern keepers for any news.
