Drop all ICMP packets?

Is it ok for me to drop all types of ICMP packets? I.e. iptables -I INPUT -p icmp -j DROP. Everything except one service seems to work. I already stopped this service. To be specific I functioned as non-exit Tor relay and that seems to have stopped working. In 2 days I dropped 107K ICMP packets, which seems excessive to me, isn't that so? Note, that I run some other services (on open ports) like Bitcoin.