Technical definition Drug- a substance which has an effect on the body. Ie literally everything you ingest.
Common parlance - a thing you take which has a medical or recreational effect. Ie paracetamol or weed.
Smoking (a drug) and alcohol (a drug) are common enough that they don’t count as drugs to most people so medics will usually ask smoking alcohol and drugs as 3 separate questions to cover all bases.
Depends on the crowd you’re out with but it is nice to see the younger generations drinking less. Got to be healthier for them.