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We present some straightforward applications of the QCD heavy quarkexpansion, stated in previous papers [1-3], to the inclusive widths of heavyflavour hadrons. We address the question of the $D_s$ lifetime and argue that-- barring Weak Annihilation (WA) -- $\tau (D_s)$ is expected to exceed $\tau(D^0)$ by several percent; on the other hand WA could provide a difference ofup to $10\div20\%$ of {\it any} sign. We extract $m_c$, $m_b$ and $|V_{cb}|$from $\Gamma\ind{SL}(D^+)$ and $\Gamma\ind{SL}(B)$. The values of the quarkmasses are somewhat higher, but compatible with estimates from QCD sum rules;we obtain $|V_{cb}|\simeq 0.043$ for $\tau (B)=1.4$ psec and$BR_{SL}(B)=10.5$\% . We discuss the associated uncertainties in the $1/m_Q$expansion as well as some consequences for other electroweak decays.Comment: 18 pages Preprint UND-HEP-93-BIG05, CERN-TH.7063/93; this is the  revised version. Summary of changes: The discussion of uncertainties in the  $1/m_Q$ expansion was shortend as the more detailed one was presented in our  recent paper ref.[16] and is due in the forthcoming paper [17]. The sections  3 and 4 are then combine

D s lifetime,m b ,m c and |V cb | in the heavy quark expansion