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is nicotine a natural part of tobacco
is nicotine part of tobacco
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is nicotine a natural substance
is nicotine from tobacco
is nicotine found in tobacco
does nicotine occur naturally in tobacco
is nicotine a natural part of tobacco, is nicotine part of tobacco, does natural tobacco contain nicotine, is nicotine a natural substance, is nicotine from tobacco, is nicotine found in tobacco, does nicotine occur naturally in tobacco
