I take umbrage with broad statements like, "everyone in sales has lied". It simply isn't accurate.
It is never appropriate to lie whether you're selling, roofing, nursing, driving a cab, etc.
Integrity is the basis for truly meaningful two-way communications with your business network. After all, if the other party cannot trust what you say, how can you conduct business with them?
If you're lying to your prospects, are you lying at work about your prospects?
Small lies, white lies, omission, etc. are all part of the same under-pinning for your personal integrity. After a day of the above, if you are able to clear-off that shaving mirror in the morning and feel good about yourself, you're in for a surprise. You simply cannot sustain long term business relationships based upon deceit.
Treat them all in the manner which you want to be treated!
Good luck & Good selling!
Pat