Firstly, I don't think you're being unreasonable and I'm sorry your husband doesn't seem to respect your feelings about this.

We are lucky and don't know anyone who smokes so haven't had to worry about this but I would not be okay with it around DD at all. To me, it doesn't matter if it is being blown into her face or just in the general area near her and I also don't want it to be something she is exposed to as an activity, chemicals aside. I would find it hard to be comfortable with my DD even being around someone after they had smoked at another location as it still clings in your clothes, hair etc... I remember pre-DD how much my clothes used to stink just after being out in town for a night, not being near smokers just in their general vacinity so I can only imagine what it would be like for someone physically smoking. Some people probably think that is being too paranoid/over-the-top but just as it is their choice to smoke, it is my choice to try and avoid being anywhere near it.