We study the changes in greeting behavior caused by the COVID-19 pandemic. We find that after the use of handshakes and social kissing as forms of greeting decreased drastically, they became common again already a few months after the outbreak. Nevertheless, a consistently large proportion of respondents (around 57%) plan to change their greeting behavior permanently, either because they simply became used to it or because they want to avoid the danger of contracting and transmitting infectious diseases. As can be seen from the results of the first survey wave in April, 2020, the belief in conspiracy theories about COVID-19 did not influence the greeting behavior of individuals, but it proved to have a strong impact in the second survey wave in September, 2020.