American, Unitarianism E. Mis
When you dream of smoking and then using an ashtray it means that you want to get rid of your old sentiments and approaches. In other words this dream represents your wish to forget the things that happened in the past and requirement to move on.
Psychological Meaning: The dream symbol of ashtray indicates everything what is negative - attitudes and thoughts, especially on feeling of meaninglessness of life. This dream signifies that you should try to overcome this negative mental content with all the force as soon as possible.
To see or use an ashtray in your dream suggests you are trying to rid yourself of old feelings, memories and habits. It also symbolizes relationships that have been extinguished and no longer intact.
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A clean ashtray can represent a decision that you have to make, while a dirty ashtray can represent a fear that you have already made a bad decision.
See also: What is the meaning of Free, Relationships, Dream, New, Current?