There are three kinds of people: Those lucky b.....s who never experience motion sickness in any thing, those who feel ill at first and then adapt with repeated exposure (the time scale varies from an hour or so, to in my case, three years) and those unlucky few who will to a greater or lesser degree always feel ill.
The interesting thing is that some people who feel ill in one form of transport or situation, don't in others. The frequency of the motion or disturbance seems to have something to do with it. I've never felt car sick but do in aeros if I'm not in regular practice. Aeros don't affect my wife at all but she gets ill in cars if she is not looking out.