That's normal. I have even more running:
root@molly:~#ps -ax | grep smb
997 ?? Ss 0:09.05 /usr/local/sbin/nmbd -D -s /usr/local/etc/smb.conf
1001 ?? Is 0:03.52 /usr/local/sbin/smbd -D -s /usr/local/etc/smb.conf
1005 ?? Ss 0:01.29 /usr/local/sbin/winbindd -s /usr/local/etc/smb.conf
1042 ?? I 0:00.00 /usr/local/sbin/smbd -D -s /usr/local/etc/smb.conf
1065 ?? I 0:00.38 /usr/local/sbin/winbindd -s /usr/local/etc/smb.conf
1125 ?? I 0:00.04 /usr/local/sbin/winbindd -s /usr/local/etc/smb.conf
1126 ?? I 0:00.00 /usr/local/sbin/winbindd -s /usr/local/etc/smb.conf
76486 ?? I 0:01.40 /usr/local/sbin/smbd -D -s /usr/local/etc/smb.conf
85565 ?? I 0:43.19 /usr/local/sbin/smbd -D -s /usr/local/etc/smb.conf
82978 1 S+ 0:00.00 grep smb