Are you talking about lime Ca(OH)2 or lye NaOH ? CaOH doesn't exist
I can't imagine lime causing a harshness problem, it's completely non-volatile and doesn't dissolve at all in naphta.
If there is any hydroxide present in fresh spice, it cannot last long because it's converted to carbonate by CO2 in the air, just leave it for a day or so and/or do a quick icecold ammonia wash (I never had a problem with that although other people have).
Whatever: don't smoke it if it's so harsh!