Age When Started using Smokeless Tobacco after Regular Use Question

**Semantic type:** Qualitative Concept

**Definition:** A question about the age of an individual when they started using smokeless tobacco after at least six weeks regular use.

**Synonyms:** - Age When Started using Smokeless Tobacco after Regular Use - If the patient used smokeless tobacco (including chewing tobacco and snuff) regularly for at least six weeks, how old were they when they started using