Salt E Liquid 35mg or 50mg Nicotine For my dad.

So my dad birthday is this week and he wants tried to stop smoking i told him about the pod vaping devices I'm going to buy him one of them but don't know what should I 35mg or 50mg he smokes Newport or should i get him something with lower nicotine. Also I'm old enough to buy this stuff 25 years old.

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