Using a saline nasal spray after snorting your lines will help greatly. It creates moisture so the drug can absorb better. Also it helps get any caked powder stuck in your nose/mucus membranes un-stuck.
If there was pre-existing damage due to snorting pills, using nasal spray will not make the damage disappear, but it can help prevent further damage from occurring. Not 100%, but better than nothing.
Truly the only way to avoid any and all damage due to insufflation, is quite simply to not snort anything anymore.
You can try to create a liquid solution with saline + amphetamine (adderal) and use the spray bottle to administer it. It is quite simple to do. There are a number of threads on it. If you are interested and need help with it let me know.
Plugging is also quite effective with adderal, more so than snorting. The bio-availability of adderal is:
Oral: 20-25%
Nasal: 75%
Rectal: 95-99%
IV: 100%
As you can see, plugging is almost effective as IV ! Some people are anti butt-hole mongers on here, so I am not sure if you are for or against plugging. It isn't gay, and it doesn't hurt or anything.. It is definitely worth it with certain drugs. It hits you very quickly, and you can get a "rush" from it, that's how fast it hits you.