That's a good point --
"Smoking" used to be A) relatively cheap and B) a simple smoking of tobacco leaves.
Now, smoking is a huge waste of money, and modern cigarettes have literally a THOUSAND other substances in them besides tobacco. They are designed to be addictive, and are known to cause numerous health problems.
Because of the new substances added to strengthen the addiction, they will make a man more tempted (than he would normally be) to keep smoking, even if his family BEGINS TO need the money elsewhere.
St. Pius X smoked cigars, right? Not Marlboro cigarettes. There IS a difference.
But we're not St. Pius X, and we don't live in 1910 with its particular mix of intelligence and ignorance. They really didn't know how harmful smoking was -- or maybe smoking pure tobacco isn't as harmful as today's cigarettes?
People love having a good excuse to do something harmful, a bad idea, worldly, or all of the above. The old, "Fr. X said he watched Lord of the Rings. Therefore, I'm going to watch network TV, indiscriminately, on a regular basis."
At any rate, I'm sure that people using cell phones today aren't committing a sin, but in 40 years when people are dying left and right from brain tumors, using a cell phone will be considered self-harm... or even attempted ѕυιcιdє (just kidding).
Matthew