I'm not specialist in nicotine, but I read that nicotine in high dosage could be toxic. In small dosage could be healthy (in some cases). I don't think small children need nicotine anyway (they usually don't have health problems like adults or old people). But maybe your daughter is allergic to commercial cigarettes. Many additional substances that are added to commercial cigarettes, increases nicotine reactivity (or acts as allergens itself). When I was young, I don't liked cigarettes (I don't need them), but I noticed that different brands of cigarettes smells different (smoke). When I was young I had very good smell. Nowadays I know, is not because different tobacco brands, but additional substances can change smell of smoke.