Is smoking sinful? I hope drinking a few beers isn't or I am in big trouble!
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The body of Pope St. Pius X is incorrupt.
He smoked, even arriving a few minutes late for audiences due to having a cigarette with a member of the Vatican Swiss Guards, just outside the meeting room.
BLESSED Pius IX had a cigar factory built on Vatican grounds.
John XXIII smoked. His favorites were Winstons, I believe.
The Handbook of Moral Theology by Fr. Dominic Proemmer, OP explicitly states that tobacco is not considered an impediment to receiving communion, by reason of breaking the Eucharistic fast, by the Church.
On the other hand, there were and are some baptized Catholics who were or, to this day, are virulently anti-smoking. One of them was an Austrian paperhanger who became quite widely known in his day.
The only time alcohol enjoyment is sinful is if it is consumed in an amount which impairs the function of reason. Naturally, that means that excessive use that leads to impaired driving or the excitation of base passions or the impairment of judgment and/or ability to carry out one's proper duties is not to be engaged in.
Speaking only for myself, I find it most salutary, during Lent, to abstain altogether from lighting up... during sermons, no matter how boring.