Yes smoking is included.
There are conditions for this precepts
i) There must be an intoxicant.
ii) There must be the intention of taking it.
iii) Action must be taken to ingest it.
iv) There must be actual ingestion of the intoxicant.
Condition
(iv) states clearly that the precept is broken once the intoxicant is ingested intentionally. It does not matter whether one is intoxicated or not as a result of the action.
In taking medicines containing alcohol or intoxicating drugs for medical reasons, no breach of the precept is committed. This is because one's intention is to take the medicine to cure one's sickness.
Refer to this document here, Five Precepts, says the following about the fifth precept:
Suramerayamajja pamadatthana veramani sikkhapadam samadiyami
There are four conditions for the partaking of intoxicants.
I undertake the precept to refrain from intoxicating drinks and drugs which lead to carelessness.
i) There must be an intoxicant.
ii) There must be the intention of taking it.
iii) Action must be taken to ingest it.
iv) There must be actual ingestion of the intoxicant.
Condition (iv) states clearly that the precept is broken once the intoxicant is ingested intentionally. It does not matter whether one is intoxicated or not as a result of the action.
In taking medicines containing alcohol or intoxicating drugs for medical reasons, no breach of the precept is committed. This is because one's intention is to take the medicine to cure one's sickness.
Ref:See also this description, http://www.accesstoinsight.org/ptf/dhamma/sila/pancasila.htmlThe Five Precepts pañca-sila:
Suramerayamajja pamadatthana veramani sikkhapadam samadiyami
I undertake the precept to refrain from intoxicating drinks and drugs which lead to carelessness.