Largely yes, but within reason, and only when under direct parental supervision. Drinking and smoking can be part of religious or cultural practices, so a small amount of that should be completely acceptable. But these should only be allowed within the home, with an exception for media, which should be allowed w/o supervisio with explicit permission (e.g. a written note or verbal confirmation at a theater or something).

Allowing these could constitute child abuse, but I don’t think there should be a blanket ban.