Difficult to judge, in theory, yes - even watching the daily news can sometimes be bad. However, the helicopter is a very good-natured aircraft that does not react as strongly to possible turbulence as small aircraft - also called fixed-wing aircraft (e.g. Cessna). This means that the risk of nausea is much lower. It happens very rarely that a passenger gets sick, but not never. What we hear from our passengers 99% of the time is: "It was much less shaky than we thought".