9mg Nicotine Level e-Liquid is on the higher nicotine level side. This is a good nic level to work toward if you are currently using 12mg or 24mg nicotine level juice. You'll find 9mg nic liquids to be slightly harsher than the more popular 6mg nic level juices. You can use these 9mg nic e-liquids in tanks, but beware if you use them in drippers as they might be too strong.
The Cloud Company (a Suicide Bunny line) is the most popular e-liquid brand to come in 9mg nic strengths. They also come in 0mg, 3mg, and 6mg nic levels. Arise is the most popular flavor in that line. Pick up a 9mg nic level bottle of Arise and you'll enjoy a Max VG version of a juice that uses the same recipe as Mother's Milk.
If you're more into fruit smoothie flavors, try Cloud Company Kumo in a 9mg nicotine level. This is a staff favorite here at MaxVaping.