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Sure, Lincoln being a Whig first and a Republican second was all in favor of tariffs. Whe he took office in 1860 and the Southern States had already started to seceed, he asked the question "Where will my tariffs come from?" Put it together for yourself, if you can.

You asked why the South seceded if it wasn't over slavery here is your answer - (Note slavery is mentioned, but it isn't the main reason if you look at them as a whole)
1. Our States entered the Union with the understanding that they had the right to withdraw when membership proved unhappy.
2. We were tired of being gypped by unfair tariff laws. (That started in 1788 when the Northern States by act of Congress shifted the burden of their fair share of the debt for the War of Independence on to the Southern States, and then on through protecticve tariff enactments that favored the Northern States at the expense of the South).
3. We were fed up with insane abuse from South-hating fanatics. Harriet Beecher Stowe (a New Englander who never visited the South in her lifetime) and John Brown, and the Abolitionists who all took pains to incite Southern slaves to rise against their masters. They poured torrents of abuse on the slave owners by putting out the story of Southern Plantation owners being infamously immoral. They (the Abolitionists) denounced the membership of a certain group of Southern churches as "incarnate fiends", "endorsers of crime of depraved humanity." One enthusiast wrote that Southern men came North to find wives because of fear that Southern girls were unworthy. (A patent falsehood!)
4. We bought our slaves from the North, only to learn later that it proposed to free them without a penny of compensation.
5. Northern fanatics had inspired murderous slave-uprisings. Why wait for more?
6. A rabidly-sectional party was in control at Washington.
7. We had no idea of making war. We planned to relieve the North from further association with us.

Lest you conclude that only Southerners believed they had the right to go their own way and be let alone, bear in mind the view of Henry Cabot Lodge, a New England Brahmin. He said as of the date of the adoption of the Constitution, it waws universally regarded as an experiment, entered upon by the States, and from which any State had the right to peaceably withdraw.