Code:
blitz@inode ~ % journalctl -xb | grep -Ein "smart"   
2117:Aug 30 12:44:57 inode systemd[1]: Listening on PC/SC Smart Card Daemon Activation Socket.
2492:Aug 30 12:44:58 inode systemd[525]: Not generating service for XDG autostart app-cinnamon\x2dsettings\x2ddaemon\x2dsmartcard-autostart.service, startup phases are not supported.
2880:Aug 30 12:44:59 inode systemd[1]: Started PC/SC Smart Card Daemon.
3272:Aug 30 12:46:00 inode systemd[1]: Started PC/SC Smart Card Daemon.
4794:Aug 31 09:16:37 inode smartd[11270]: smartd 7.0 2018-12-30 r4883 [x86_64-linux-5.8.5-zen1-1-zen] (local build)
4795:Aug 31 09:16:37 inode smartd[11270]: Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org
4796:Aug 31 09:16:37 inode smartd[11270]: Opened configuration file /etc/smartd.conf
4797:Aug 31 09:16:37 inode smartd[11270]: Drive: DEVICESCAN, implied '-a' Directive on line 23 of file /etc/smartd.conf
4798:Aug 31 09:16:37 inode smartd[11270]: Configuration file /etc/smartd.conf was parsed, found DEVICESCAN, scanning devices
4799:Aug 31 09:16:37 inode smartd[11270]: Device: /dev/sda, opened
4800:Aug 31 09:16:37 inode smartd[11270]: Device: /dev/sda, [ATA      SanDisk SDSSDHII 00RL], lu id: 0x5001b44c6c5951e1, S/N: 143357400545, 120 GB
4801:Aug 31 09:16:37 inode smartd[11270]: Device: /dev/sda, IE (SMART) not enabled, skip device
4802:Aug 31 09:16:37 inode smartd[11270]: Try 'smartctl -s on /dev/sda' to turn on SMART features
4803:Aug 31 09:16:37 inode smartd[11270]: Device: /dev/sdb, opened
4804:Aug 31 09:16:37 inode smartd[11270]: Device: /dev/sdb, [ATA      ST500DM002-1BD14 KC65], lu id: 0x5000c50061ef6259, S/N: S2AHCSV7, 500 GB
4805:Aug 31 09:16:37 inode smartd[11270]: Device: /dev/sdb, IE (SMART) not enabled, skip device
4806:Aug 31 09:16:37 inode smartd[11270]: Try 'smartctl -s on /dev/sdb' to turn on SMART features
4807:Aug 31 09:16:37 inode smartd[11270]: Unable to monitor any SMART enabled devices. Try debug (-d) option. Exiting...

blitz@inode ~ % smartd -d                         
smartd 7.0 2018-12-30 r4883 [x86_64-linux-5.8.5-zen1-1-zen] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

Opened configuration file /etc/smartd.conf
Drive: DEVICESCAN, implied '-a' Directive on line 23 of file /etc/smartd.conf
Configuration file /etc/smartd.conf was parsed, found DEVICESCAN, scanning devices
Device: /dev/sda, opened
Device: /dev/sda, [ATA      SanDisk SDSSDHII 00RL], lu id: 0x5001b44c6c5951e1, S/N: 143357400545, 120 GB
Device: /dev/sda, IE (SMART) not enabled, skip device
Try 'smartctl -s on /dev/sda' to turn on SMART features
Unable to register SCSI device /dev/sda at line 23 of file /etc/smartd.conf
Device: /dev/sdb, opened
Device: /dev/sdb, [ATA      ST500DM002-1BD14 KC65], lu id: 0x5000c50061ef6259, S/N: S2AHCSV7, 500 GB
Device: /dev/sdb, IE (SMART) not enabled, skip device
Try 'smartctl -s on /dev/sdb' to turn on SMART features
Unable to register SCSI device /dev/sdb at line 23 of file /etc/smartd.conf
Unable to monitor any SMART enabled devices. Exiting...